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YOKOGAWA CW120 Communication Function Manual
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YOKOGAWA CW120 Communication Function Manual

YOKOGAWA CW120 Communication Function Manual

Clamp-on power meters
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Yokogawa CW121
3-Phase 4-Wire Clamp-On Power Meter
A l l t r a d e m a r k s , b r a n d n a m e s , a n d b r a n d s a p p e a r i n g h e r e i n a r e t h e p r o p e r t y o f t h e i r r e s p e c t i v e o w n e r s .
• C r i t i c a l a n d e x p e d i t e d s e r v i c e s
• I n s t o c k / R e a d y - t o - s h i p
Artisan Scientific Corporation dba Artisan Technology Group is not an affiliate, representative, or authorized distributor for any manufacturer listed herein.
In Stock
Used and in Excellent Condition
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https://www.artisantg.com/90160-1
• We b u y y o u r e x c e s s , u n d e r u t i l i z e d , a n d i d l e e q u i p me n t
• F u l l - s e r v i c e , i n d e p e n d e n t r e p a i r c e n t e r

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  • Page 1 Yokogawa CW121 3-Phase 4-Wire Clamp-On Power Meter In Stock Used and in Excellent Condition Open Web Page https://www.artisantg.com/90160-1 A l l t r a d e m a r k s , b r a n d n a m e s , a n d b r a n d s a p p e a r i n g h e r e i n a r e t h e p r o p e r t y o f t h e i r r e s p e c t i v e o w n e r s .
  • Page 2 CW120/121 User’s CLAMP-ON POWER METERS Manual Communication Functions IM CW120C-E IM CW120C-E 3rd Edition: May 2007 (KP)
  • Page 3 * PR201: Yokogawa panel-mounted power monitor * Higher-level devices: PCs, PLCs (sequencers), graphic panels, and others. For details on the functions or how to operate the CW120/121, see the IMCW120-E user’s manual, "CW120/121 Clamp-on Power Meters." FD No. IM CW120C-E 3rd Edition: May 2007 (KP) All Rights Reserved.
  • Page 4 (3) This manual is intended to describe the functions of this product. Yokogawa (hereinafter simply referred to as Yokogawa) does not guarantee that these functions are suited to the particular purpose of the user.
  • Page 5 Introduction CAUTION Indicates a hazard that may result in an injury to the user and/or physical damage to the product or other equipment unless the described instruction is abided by. NOTE Indicates information that is essential for handling the instrument or should be noted in order to familiarize yourself with the instrument’s operating procedures and/or functions.
  • Page 6 (1) Yokogawa does not make any warranties regarding the product ex- cept those mentioned in the WARRANTY that is provided separately. (2) Yokogawa assumes no liability to any party for any loss or damage, direct or indirect, caused by the use or any unpredictable defect of the product.
  • Page 7 1.3.1 Setup Procedure of Communication ..........1-3 1.3.2 Wiring for Communication .............. 1-3 1.3.3 Setting Communication Parameters ..........1-6 Chapter 2. Communication Dedicated to CW120/121 ........ 2-1 2.1 Overview ....................2-1 Chapter 3. Power Monitor (PR201) Communication ........3-1 3.1 Overview ....................3-1 3.2 Communication Specifications ..............
  • Page 8 Chapter 6. Functions and Usage of D Registers and I Relays ....6-1 6.1 Functions and Usage of D Registers ............ 6-1 6.1.1 Power Monitor PR201 Common Register Map ......6-2 6.1.2 CW120/121 Dedicated Register Map ..........6-5 6.2 Functions and Usage of I Relays ............6-10 IM CW120C-E...
  • Page 9 Chapter 1 Communications Overview Communications Overview Overview The CW120/121 has either an RS-232 serial communication interface or RS-485 serial communication interface, through which data exchange can be performed with a device such as a personal computer, PLC (sequencer), or graphic panel.
  • Page 10 Chapter 1 Communications Overview Interface Specifications • Specifications common to RS-232 and RS-485 communication Synchronization: Asynchronous Station number: 001 to 999 Baud rate: 1200, 2400, 4800, 9600, 19200, 38400 bps Data bits: 7 or 8 bits Parity: Odd, even, or none Start bits: Fixed to 1 bit Stop bits:...
  • Page 11 This chapter describes the procedure to set up the communication functions and also refers to some notes on wiring and communication parameters. 1.3.1 Setup Procedure of Communication Set up the communication functions of the CW120/121 as follows: (See Connect a higher-level device and a CW120/121. section 1.3.2.)
  • Page 12 100Ω or less) Maximum number of units connectable: 31 (except for ML1- Maximum distance: 1.2 km [NOTE] ML1- is the converter of Yokogawa M&C Corporation. You can also use other RS-232/RS-485 converters. Before you use another converter, check its electrical specifications. CAUTION Do not share the grounding wire with another controller.
  • Page 13 (2) Wiring to a PLC (Sequencer) or Graphic Panel Since general PLCs (sequencers) and graphic panels have an RS-485 interface, they can be directly connected to a CW120/121. If your PLC (sequencer) or graphic panel has an RS-232 interface, see subsection (1) .
  • Page 14 Follow the procedure below to set the communication protocol supported by the higher-level device. <Procedure> 1) When the measurement screen of the CW120/121 is displayed, press the MEAS/SET key to call the setting item selection screen. 2) Press either the key or key until "...
  • Page 15 Chapter 1 Communications Overview (2) Setting Station Number Follow the procedure below to set the device number (station number) of the CW120/121 within the device number limits (Table 1.2) specific to each communication protocol. Table 1.2 Communication protocols and device number limits...
  • Page 16 12) Press the MEAS/SET key to return to the measurement screen. Setting item Baud rate Data length selection screen Stop bits Parity : None : Even : Odd SEE ALSO Chapter 7 of the IM CW120-E user's manual for details on how to make settings. IM CW120C-E...
  • Page 17 Overview Communication dedicated to CW120/121 allows a variety of measurement values to be read by a higher-level device and the CW120/ 121 to be configured from a higher-level device. The communication protocol used is different than that used during RS-232 or RS-485 communication.
  • Page 18 Any time-out pro- cess therefore should be run at the higher-level personal computer. Set the time-out option to a value no smaller than one second. The CW120/121 returns an error re- sponse if the parameter or data is erroneous. Commands and Responses...
  • Page 19 Chapter 3 Power Monitor (PR201) Communication Response elements: 1 byte 2 bytes 1 byte 2 bytes Variable-length 2 bytes 1 byte 1 byte Station Parameter Data Response Check sum number Range of sum check STX: Start of Text (hexadecimal: 02) Response: 2-byte ASCII code (DG or DP) Parameter:...
  • Page 20 Chapter 3 Power Monitor (PR201) Communication List of Commands Table 3.1 Command:DG (1/3) Para- Power Power monitor Power Descriptions Response CW120/121 monitor meter monitor response data data size response data adaptable format response models data range Measured No optional Data of parameters 1 to 5...
  • Page 21 Chapter 3 Power Monitor (PR201) Communication Table 3.1 Command:DG (2/3) Para- Descriptions Power Power monitor Power Response CW120/121 meter monitor response data monitor data size response data adaptable format response models data range „. „„„E+O Voltage 1 0.001E+2 to 8 bytes 0.000E+0 [V]...
  • Page 22 Chapter 3 Power Monitor (PR201) Communication Table 3.1 Command:DG (3/3) Para- Descriptions Power Power monitor Power Response CW120/121 meter monitor response data monitor data size response data adaptable format response models data range „. „„„E+O Voltage 2 0.001E+2 to 8 bytes 0.000E+0 [V]...
  • Page 23 Chapter 3 Power Monitor (PR201) Communication Table 3.2 Command:DP Power Power monitor Power Command CW120/121 Para- Descriptions monitor command data monitor data size response data meters adaptable format command data models range Set value No data (response *1) 0 byte...
  • Page 24 PCs, PLCs (sequencers), and graphic panels. Via this communication protocol, these devices can exchange data with CW120/121 by reading/writing the internal registers (D regis- ters) of a CW120/121. Hereafter, PCs, PLCs (sequencers), and graphic panels are referred to as “higher-level devices.”...
  • Page 25 Chapter 4 MODBUS Communication 4.1.1 Configuration of Messages Messages sent from a higher-level device to a CW120/121 consist of the following elements. Element Start of Address Function Data Error End of Message Number Code Check Message Mode Mark (ADR) Mark...
  • Page 26 In such a case, decrease the baud rate. 4.2.1 List of Function Codes Function codes are command words used by the higher-level device to obtain the D register information of CW120/121. Table 4.2 Function Codes Code Function...
  • Page 27 Chapter 4 MODBUS Communication Error Check MODBUS communication has two modes: ASCII mode which is ASCII- text communication and RTU mode which is binary communication. These two modes use different error check methods. 4.3.1 ASCII Mode In ASCII mode, an error check is run using the LRC method, i.e., logical redundancy check.
  • Page 28 For a function for writing to multiple registers, the CW120/121 returns part of the received command message as the response message. For a readout function, the CW120/121 adds the read data to the ends of the address number and function code of the received command message, and returns the message as the response message.
  • Page 29 Abnormal register number Abnormal number of registers The CW120/121 does not regard it as an error even if there is any unused register among those with consecutive register numbers specified by a read-out function; rather, the CW120/121 returns a value of 0 in this case.
  • Page 30 Chapter 4 MODBUS Communication Commands 4.5.1 Function Code 03: Readout of D Registers In the example shown here, the function reads four consecutive registers starting from the register D0043 of the slave with the slave address 17. Take special note of the fact that the Starting D Register Number field is set to “42”.
  • Page 31 Chapter 4 MODBUS Communication Table 4.4 Message Sent from Slave Example for ASCII Mode Example for RTU Mode Contents Element (Reference only) (Reference only) Start-of-message mark 3Ah (: colon) (24-bit time) Address 0001 0001 03 (= function code) 0000 0011 Byte count 8 bytes 0000 1000...
  • Page 32 Chapter 4 MODBUS Communication 4.5.2 Function Code 06: Writing to a Single D Register Table 4.5 Message Sent from Master Start-of-message mark Address 06 (= function code) D register number (higher-order) D register number (lower-order) Data to write (higher-order) Data to write (lower-order) Error check data End-of-message mark * Data to write: Optional.
  • Page 33 Chapter 4 MODBUS Communication Table 4.8 Message Sent from CW120/121 Start-of-message mark Address 08 (= function code) Diagnostic code (higher-order) fixed to 00 Diagnostic code (lower-order) fixed to 00 Data (higher-order) Data (lower-order) Error check data End-of-message mark Data: Varies depending on the diagnostic code sent from higher-level device.
  • Page 34 I relay" (Chapter 6). The next section will discuss the configuration of commands and re- sponses. 5.1.1 Configuration of Commands Commands sent from a higher-level device to a CW120/121 consist of the following elements. Number of bytes Variable length...
  • Page 35 A communication failure will result if any of them are omitted or if the order is incorrect. 5.1.2 Configuration of Response Responses from a CW120/121 with respect to a command sent from the higher-level device consist of the elements shown below, which differ depending on the condition of communication − normal or failure.
  • Page 36 • No response is made in case of an error in address number specification or CPU number specification. • If a CW120/121 cannot receive an ETX contained in a command, a response may not be made. * As a measure against these situations, provide a timeout processing in the communication functions or communication programs of the higher-level device.
  • Page 37 Chapter 5 PC Link Communication Response Error Codes The error codes (EC1) and detailed error codes (EC2) of response are as follows. EC2 is no-meaning when error code (EC1) is not included in following table 5.2. Table 5.1 Error Codes (EC1) Error code Meaning Causes...
  • Page 38 Chapter 5 PC Link Communication List of Commands The following are the lists of commands available in PC link communica- tion. Table 5.3 Bit-basis Access Commands Dedicated to I Relays Command Description Number of bits handled Bit-basis read 1 to 48 bits Bit-basis write 1 to 32 bits Bit-basis, random read...
  • Page 39 (n = 1 to 48) dn = 0 (OFF) dn = 1 (ON) Example: Reading the input overrange against full input scale of the CW120/121 with address number 01. The following command reads the status of I0001 at address number 01. [Command] [STX]01010BRDI0001, 001[ETX][CR] The following response is returned with respect to the above command.
  • Page 40 Bytes Address Check Response (Station number element number) Example: Setting the Remote reset (I0010) of the CW120/121 with address number 01 to ON. [Command] [STX]01010BWRI0010, 001, 1[ETX][CR] “OK” is returned in response to the command above. [Response] [STX]0101OK[ETX][CR] IM CW120C-E...
  • Page 41 (n = 1 to 32) dn = 0 (OFF) dn = 1 (ON) Example: Reading the Input overrange against full input scale (I0001) and the Remote reset (I0010) of the CW120/121 with address number 01. [Command] [STX]01010BRR02I0001, I0010 [ETX][CR] In response to the command above, the ON and OFF responses are returned for I0001 and I0010 respectively.
  • Page 42 Example: Setting the Remote reset (I0010) and the Stop of optional power integration (I0014) of the CW120/121 with address number 01 to ON and OFF. [Command] [STX]01010BRW02I0010, 1, I0014, 0[ETX][CR] “OK” is returned in response to the command above.
  • Page 43 Example: Monitoring the Input overrange against full input scale (I0001) and the Remote reset (I0010) of the CW120/121 with address number 01. (This command is used simply for specifying registers.) [Command] [STX]01010BRS01I0001,I0010[ETX][CR] “OK” is returned in response to the command above.
  • Page 44 = 0 (OFF) dn = 1 (ON) Example: Monitoring the Input overrange against full input scale (I0001) and the Remote reset (I0010) of the CW120/121 with address number 01. (This command reads the statuses of the I relays specified by the BRS command.)
  • Page 45 = 1 to 64 Example: Reading the Integrated power (uint32; lower-order 2 bytes) (D0001) and the Integrated power (uint32; higher- order 2 bytes) (D0002) of the CW120/121 with address number 01. [Command] [STX]01010WRDD0001, 02[ETX][CR] The Integrated power (uint32; lower-order 2 bytes) (D0001) value (03E8(HEX)) and the Integrated power (uint32;...
  • Page 46 Example: Writing 0380(HEX) into the PT ratio (float upper 2 bytes) (D0044) and 0000(HEX) into the PT ratio (float lower 2 bytes) (D0043) of the CW120/121 with address number [Command] [STX]01010WWRD0043, 02, 03800000[ETX][CR] “OK” is returned in response to the command above.
  • Page 47 The response is returned in a 4-digit character string (0000 to FFFF) in a hexadecimal pattern. ddddn = character string in a hexadecimal pattern (n = 1 to 32) Example: Reading the Integrated pulse Characteristic (int 16 bits) (D0051) and the area for user (D0104) of the CW120/121 with address number 01. [Command]...
  • Page 48 Example: Writing 0014(HEX) into the area for user (D0104) and 0005(HEX) into the area for user (D0105) of the CW120/ 121 with address number 01. [Command] [STX]01010WRW02D0104, 0014, D0105, 0005[ETX][CR] “OK” is returned in response to the command above.
  • Page 49 Example: Monitoring the integrated power (uint32; lower-order 2 bytes) (D0001) and the integrated power (uint32; higher- order 2 bytes) (D0002) of the CW120/121 with address number 01. (This command simply specifies the registers.) [Command] [STX]01010WRS02D0001,D0002[ETX][CR] “OK” is returned in response to the command above.
  • Page 50 = 1 to 24 Example: Monitoring the integrated power (uint32; lower-order 2 bytes) (D0001) and the integrated power (uint32; higher-order 2 bytes) (D0002) of a CW120/121 with address number 01. (This command reads the status of the register specified by the WRS command.)
  • Page 51 Chapter 5 PC Link Communication 5.4.13 INF Reads the model, version, and revision information. Function Reads the model code, version number, and revision number of the Power Monitor. • For the format of response in the event of failure, see subsection 5.1.2.
  • Page 52 I Relays Functions and Usage of D Registers Various types of data are allocated to the D registers of the CW120/121. A higher-level device can acquire data from the CW120/121 or control the CW120/121 by accessing these D registers through MODBUS personal computer link communication.
  • Page 53 Chapter 6 Functions and Usage of D Registers and I Relays 6.1.1 Power Monitor PR201 Common Register Map The following lists common register areas used by both CW120/121 and Power Monitor PR201. Table 6.2 D Register Map and Common Registers of Power Monitor PR201 (1/3) D-Reg Ref No.
  • Page 54 Chapter 6 Functions and Usage of D Registers and I Relays Table 6.2 D Register Map and Common Registers of Power Monitor PR201 (2/3) D-Reg Ref No. H No. Power Monitor CW120/121 Data Range Register Description Read/Write Data Range and Data Processing...
  • Page 55 Chapter 6 Functions and Usage of D Registers and I Relays Table 6.2 D Register Map and Common Registers of Power Monitor PR201 (3/3) D-Reg Ref No. H No. Power Monitor CW120/121 Data Range Register Description Read/Write Data Range and Data Processing...
  • Page 56 Chapter 6 Functions and Usage of D Registers and I Relays 6.1.2 CW120/121 Dedicated Register Map The following lists the dedicated register areas of the CW120/121. Table 6.3 D Register Map and Dedicated Registers of CW120/121 (1/4) D-Reg Ref No. H No. Data Range...
  • Page 57 Chapter 6 Functions and Usage of D Registers and I Relays Table 6.3 D Register Map and Dedicated Registers of CW120/121 (2/4) D-Reg Ref No. H No. Data Range Register Description Read/Write D0539 40539 0538 Current range (uint 16) 0: 5A...
  • Page 58 Chapter 6 Functions and Usage of D Registers and I Relays Table 6.3 D Register Map and Dedicated Registers of CW120/121 (3/4) D-Reg Ref No. H No. Data Range Register Description Read/Write D0566 40566 0565 Unit of electric energy (uint 16)
  • Page 59 Chapter 6 Functions and Usage of D Registers and I Relays Table 6.3 D Register Map and Dedicated Registers of CW120/121 (4/4) D-Reg Ref No. H No. Data Range Register Description Read/Write D0597 40597 0596 Power factor (float; lower-order 2 byte) Read -1.000 to +1.000...
  • Page 60 VT ratio This change only results in the saving of the setpoint in the buffer memory of the CW120/121; no change is made to the VT ratio until the status of setting change CT ratio This change only results in the saving of the setpoint in the buffer memory of the CW120/121;...
  • Page 61 Overview of I Relays Various types of information and control functions are allocated to the I relays of a CW120/121. A higher-level device can acquire data from the CW120/121 or control the CW120/121 by accessing these I relays through personal computer link communication.
  • Page 62 YOKOGAWA EUROPE B. V. (THE NETHERLANDS) Phone: 31-334-64-1611 Facsimile: 31-334-64-1610 YOKOGAWA ENGINEERING ASIA PTE. LTD. (SINGAPORE) Phone: 65-6241-9933 Facsimile: 65-6241-2606 YOKOGAWA AMERICA DO SUL S. A. (BRAZIL) Phone: 55-11-5681-2400 Facsimile: 55-11-5681-1274 YOKOGAWA MEASURING INSTRUMENTS KOREA CORPORATION (KOREA) Phone: 82-2-551-0660 to -0664 Facsimile: 82-2-551-0665 YOKOGAWA AUSTRALIA PTY.

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