AMALGAMATED INSTRUMENT PM4 Optional Output Addendum
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AMALGAMATED INSTRUMENT PM4 Optional Output Addendum

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AMALGAMATED INSTRUMENT CO
Unit 5, 28 Leighton Place Hornsby
NSW 2077 Australia
PM4 Panel Meter
Optional Output Addendum
Telephone: +61 2 9476 2244
Facsimile: +61 2 9476 2902
ABN: 80 619 963 692
e-mail: sales@aicpl.com.au
Internet: www.aicpl.com.au

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  • Page 1 PM4 Panel Meter Optional Output Addendum AMALGAMATED INSTRUMENT CO ABN: 80 619 963 692 Unit 5, 28 Leighton Place Hornsby Telephone: +61 2 9476 2244 e-mail: sales@aicpl.com.au NSW 2077 Australia Facsimile: +61 2 9476 2902 Internet: www.aicpl.com.au...

  • Page 2: Table Of Contents

    Table of Contents 1 Introduction 2 Analog, dual analog outputs plus relay option (-A, -AA, -AR, -AAR and -R options) 3 Transmitter supply option (-12, -R12, -A12 and -AR12 options) 4 Three relay output option (-RRR option) 5 Three relay plus analog output option (-ARRR option) 6 Six relay option (-R6 and -AR6 options) 7 Binary/BCD output option (-DN, -DNR, -DN12, -DP, -DPR, -DP12 and -DPR12 options)

  • Page 3: Introduction

    This manual addendum contains information on the PM4 optional outputs. This manual is supplied whenever a PM4 panel meter is supplied with an optional output fitted. Refer to the standard manual for the PM4 model purchased for information not covered in this addendum.

  • Page 4: Analog, Dual Analog Outputs Plus Relay Option (-A, -Aa, -Ar, -Aar And -R Options)

    All electrical connections are at the rear of the instrument. The plug in screw connectors used allow wire of up to 2.5mm . Refer to “Electrical Installation” chapter in the main PM4 manual for general information on electrical connections. ISOLATED ANALOG...
  • Page 5 Bipolar output connections The single and dual analog output options are available in bipolar 10V output form i.e. 10V. The bipolar output is not user configurable and must be factory set since extra components are required. The circuit board links should be set to 10V for this option. Connections are as shown below.
  • Page 6 Configuring the output board The output board has facilities for single or dual analog (4-20mA, 0-1V or 0-10V) output and an optional relay and is factory supplied with all the necessary component for the output options ordered. PCB links are fitted to the circuit board to provide data to the microprocessor and to connect the electronic components for the correct output types.

  • Page 7: Transmitter Supply Option (-12, -R12, -A12 And -Ar12 Options)

    2.5mm . Connect across D and F for 24V or across E and F for 12V or across D and E for -12V. Refer to “Electrical Installation” chapter in the main PM4 manual for general information on electrical connections.
  • Page 8 Configuring the output board The 4-20mA output will drive into 800Ω load max. PCB links are fitted to the circuit board to provide data to the microprocessor and to connect the electronic components for the correct output types. It may be necessary to alter the PCB links to change the analog output or DC voltage output (see link settings below).

  • Page 9: Three Relay Output Option (-Rrr Option)

    All electrical connections are at the rear of the instrument. The plug in screw connectors used allow for wire of up to 2.5mm . Refer to “Electrical Installation” chapter in the main PM4 manual for general information on electrical connections.

  • Page 10: Three Relay Plus Analog Output Option (-Arrr Option)

    All electrical connections are at the rear of the instrument. The plug in screw connectors used allow for wire of up to 2.5mm . Refer to “Electrical Installation” chapter in the main PM4 manual for general information on electrical connections.
  • Page 11 Configuring the output board The output board for the -ARRR option has facilities for 4-20mA, 0-1V and 0-10V output and is factory supplied with all the necessary component for the output options required. The 4-20mA output will drive into 600Ω load max. PCB links are fitted to the circuit board to provide data to the microprocessor and to connect the electronic components for the correct output types.

  • Page 12: Six Relay Option (-R6 And -Ar6 Options)

    All electrical connections are at the rear of the instrument. The plug in screw connectors used allow for wire of up to 2.5mm . Refer to “Electrical Installation” chapter in the main PM4 manual for general information on electrical connections.
  • Page 13 Configuring the output board The 4-20mA output will drive into 600Ω load max. PCB links are fitted to the circuit board to provide data to the microprocessor and to connect the electronic components for the correct output types. It may be necessary to alter the PCB links to change the analog output or DC voltage output (see link settings below).

  • Page 14: Binary/Bcd Output Option (-Dn, -Dnr, -Dn12, -Dp, -Dpr, -Dp12 And -Dpr12 Options)

    An IDC connector is used for the NPN or PNP digital output. Refer to “Electrical Installation” chapter in the main PM4 manual for general information on electrical connections. DIGITAL OUTPUT ISOLATED DC OUTPUT...
  • Page 15 NPN digital isolated output The NPN output board is provided with internal PCB links for selecting internal 5V or external V+ (5 to 50VDC) signal voltages and output continuously enabled or externally controlled. If the optional pull up resistors are not fitted the output requires an externally supplied 5VDC signal voltage on each of the output terminals used (D0 to D15).
  • Page 16 Configuring the NPN output board The digital output board is factory supplied with the necessary components for the output options required. PCB links are fitted to the circuit board to provide data to the microprocessor and to connect the electronic components for the correct output types. It may be necessary to alter the PCB links to configure to you requirements (see drawing below).
  • Page 17 VBB (17) D15 (16) D0 (1) OPTIONAL PULL-DOWN RESISTORS (19 or 20) OUTPUT ENABLE LINK 4 (18) Configuring the PNP output board The digital output board is factory supplied with the necessary components for the output options required. PCB links are fitted to the circuit board to provide data to the microprocessor and to connect the electronic components for the correct output types.

  • Page 18: Serial And 4-20Ma Output Option (-A2, -A2R, -A4 And -A4R Options)

    All electrical connections are at the rear of the instrument. The plug in screw connectors used allow for wire of up to 2.5mm . Refer to “Electrical Installation” chapter in the main PM4 manual for general information on electrical connections.
  • Page 19 Configuring the output board The PM4IS output board has facilities for RS232 or RS485 and 4-20mA output and a second relay and is factory supplied with all the necessary component for the output options ordered. PCB links are fitted to the circuit board to provide data to the microprocessor and to connect the electronic components for the correct output types.

  • Page 20: Serial, Second Relay & Transmitter Supply Output Option (-2, -4, -2R, -4R, -212, -412, -2R12 And -4R12 Options)

    Serial, second relay & transmitter supply output option (-2, -4, -2R, -4R, -212, -412, -2R12 and -4R12 options) The information provided in this section relates to PM4 panel meters with isolated RS232 or isolated RS485 outputs using the optional serial output/relay/transmitter supply board. Note: If the serial and 4-20mA output board has been fitted then the connection details below do not apply.
  • Page 21 Use 3 core shielded cable for RS232 connections. RS232 connections generally have Rx at the PM4 connected to Tx at the PLC/Computer etc. and TX at the PM4 connected to Rx at the PLC/Computer etc. RS232 connections are usually rated to a maximum cable length of approxi- mately 15 metres and are single ended in operation i.e.

  • Page 22: Serial (Rs232 And Rs485) Commands

    This mode is suitable only when the receiving unit is produced by the same manufacturer as the PM4. The most common usage would be to provide slave displays for the measuring instrument. The slave displays would automatically detect the image mode data and display the correct value accordingly.
  • Page 23 Model Continuous output Note decimal points will also be sent if displayed PM4-2CO <STX>WWWWWW,YYYYYY,XZZZZZZ<CR> where: WWWWWW is the channel 1 value (up to 6 characters/spaces) YYYYYY is the channel 2 value (up to 6 characters/spaces) “,” is a comma (44 dec, 2C hex) X is a space for positive value or “-”...
  • Page 24 POLL mode with a PC. Data is in ASCII format with 8 data bits + 1 stop bit. Addresses are offset by 32 Dec. i.e. address 1 is 33 Dec. When polling the PM4 it is essential that the command characters are sent with less than a 10mS delay between them. This normally means that each command line must be sent as a whole string e.g.
  • Page 25 Highest channel value is returned when <STX>PA<CR>. Individ- ual channels can be polled using channel number instead of “P” e.g. <STX>3A<CR> will return channel 3 value PM4-TR and PM4-QC Total in totI mode, rate in both rAtE and both modes PM4OPTMAN-2.9-0 25 of...
  • Page 26 PM4-RTC Returns the number of seconds elapsed since midnight PM4-RT8 Lowest channel value is returned PM4-TR and PM4-QC Total in both mode Other PM4’s Returns primary display value or remote input special function value 3. Transmit Tertiary Display Value: <STX>TA<CR>...
  • Page 27 Instructs the unit to return the low alarm setpoint value of the relay requested by the N character. i.e. when this command is sent the PM4 will return the alarm low setpoint value. The alarm value can be altered if required via the “Set low alarm setpoint” command which follows.
  • Page 28 Format of returned data is: <ACK>HANXYYYY<CR> Where: <ACK> is Acknowledge (6 Dec, 06 Hex) is the echo command received “H” (72 Dec, 48 Hex) is the responding units address is the setpoint number in ASCII e.g.: 31 Hex would be alarm 1 etc. is SPACE for positive and “-”...
  • Page 29 “Set Low Alarm Setpoint” command etc. 10.4 Functions applicable to model PM4-WT only The serial commands which follow are available for use with model PM4-WT only A. Tare Using Current Display Value: <STX>TA<CR> e.g.
  • Page 30 using the serial interface to change the default calibration channels then the P button or external input settings should not be set to C.SEL. Format of returned data is:- <ACK>CA<channel number> <CR> Where: <ACK> is Acknowledge (6 Dec, 06 Hex) is echo command received “C”...
  • Page 31 <ACK>gA<adc gain> <CR> Where: <ACK> is Acknowledge (6 Dec, 06 Hex) is the echo command received “g” (103 Dec, 67 Hex) is the responding units address adc gain is the adc gain as a floating point number <CR> is a Carriage Return (13 Dec, 0D Hex) F.
  • Page 32 10.5 ASCII Code Conversion Listing ASCII for control characters is shown in brackets. e.g. STX may in some cases be entered as B. ASCII char. Decimal ASCII char. Decimal ASCII char. Decimal NUL ( @) SOH ( A) STX ( B) ETX ( C) EOT ( D) ENQ ( E)

  • Page 33: Modbus Communication

    This function reads the binary contents of the holding registers in the PM4 being addressed. Each value is stored in the PM4 as a 32 bit value stored in two 16 bit registers per set of values i.e. 4 bytes per set of values. Note: an overrange indication value depends on the number of display digits e.g.
  • Page 34 0C (automatically generated number) This would be transmitted as 01 03 00 00 00 08 44 0C where: 01 is the unit address (set at the PM4 Addr function) 03 is the function number (function 3) 00 00 is the starting address of zero. Note addresses 0 to 7 correspond to registers 1 to 8.
  • Page 35 01 03 10 00 00 00 3E 00 00 00 3E 00 00 01 3D 00 00 05 8B 84 65 If the instrument were model PM4-TR (see register table which follows) then the data received (rx:) is interpreted as follows:...
  • Page 36 11.3 Register table Address Register Register contents. Comments/variations Modbus is available in PM4 models, 2C0, CO, IV, IVT, IV3, LN, LN2, PH, RS, RT8, SSI, TCR, TR and WT (rate values returned for IVT, linearised values for LN) 0x00 Display value high word...
  • Page 37 0x18 25 Decimal point value PM4-TR rate decimal point only, PM4- IV3 and PM4-LN2 channel 0 decimal point PM4-2CO channel 1 decimal point 0x19 26 Channel 1 decimal point value PM4-IV3 and PM4-LN2 only PM4-2CO channel 2 decimal point PM4-CO and PH temperature decimal...
  • Page 38 257 Modbus set A1Hi setpoint high word 0x100 PM4-CO, PH and WT only 258 Modbus set A1Hi setpoint low word 0x101 PM4-CO, PH and WT only 259 Modbus set A2Hi setpoint high word 0x102 PM4-CO, PH and WT only 260 Modbus set A2Hi setpoint low word...
  • Page 39 The registers for these modes are shown below, this mode is currently only available on model PM4-CO. PH, RS and WT panel meter. Note that when using these modes the alarm values are not stored in EPROM memory. If any alarm values are set in EPROM memory via settings entered directly via the instrument keypads in FUNC or CAL mode then these values will be the default settings which can then be overwritten by function 6 or 16 commands.
  • Page 40 An example of using function 6 to set Alarm 1 high setpoint to 2C (44 dec.) at an PM4 with address 2 is: Field name Example (Hex) Unit address (node number) Function Register address Hi Register address Lo Value Hi...

  • Page 41: Analog Pi Control Output

    Analog PI control output PI control functions will only be seen if PI control software is available for the instrument and if the optional isolated analog or dual isolated analog output is fitted. In dual analog instruments only the first output can be set for PI control output. The PI (proportional + integral) control output may be configured for proportional only (i.e.
  • Page 42 PROCESS Process above setpoint Process at setpoint SETPOINT Process below setpoint TIME 12.3 PI analog control on or off REC ctrI Display: on or OFF Range: Default Value: OFF This function determines whether the analog output will be used as a PI control output or as a retransmission output.
  • Page 43 output. Too much proportional gain will result in instability. Example 1, if the proportional gain is set to 1.000 and the measured input changes by 100% of the span set in C.SPN then the output will change by 100%. Example 2, if the proportional gain is set to 2.000 and the measured input changes by 50% of the range set in C.SPN then the output will change by 100%.
  • Page 44 This table shows the effect of the output current of changing proportional gain and offset with the following settings: C.SPN = 2.00, C.IG = 0.000 C.SEt C_PG C_Po Effect on analog output (4-20mA used in this example) 7.00 1.000 Reading of 5.00 or below - 20mA output Reading of 5.00 to 7.00 - mA output decreasing as reading ap- proaches 9.00 Reading 7.00 or above - 4mA output...
  • Page 45 OUTPUT OUTPUT 20mA 20mA C_ Po 50.0 12mA C_Po 0.0 SETPOINT SETPOINT Proportional only control examples For a 4-20mA control output (0% = 4mA and 100% = 20mA) the setpoint is 7.0, the span is 2.0, the proportional gain is 1.000 and the offset is 0.0. If the reading on the display is 6.8 then the error is 10% (i.e.
  • Page 46 the control output is ramped up or down to maintain control by keeping the process variable at the same value as the control setpoint. An integral gain which is too large will cause a rapid response to any error but can also lead to overshooting and oscillation. An integral gain which is too small will slow the time taken to reach the setpoint.
  • Page 47 12.10 PI analog integral limit low CIL.L Display: 0.0 to 100.0 Range: Default Value: 0.0 This function sets the minimum control output for the integral term value and works in the same manner as C1L.H described above except that the setting controls the low swing. 12.11 PI analog setpoint access REC SPAC...
  • Page 48 oscillate. Then reduce the integral gain slightly to regain the control with minimum oscillation. Alter the high and low integral limits to give the best regulation with minimum oscillation. Create a step change to the process conditions and observe the control results. It may be necessary to fine tune the settings to obtain optimum results.

  • Page 49: Guarantee And Service

    Guarantee and service The product supplied with this manual is guaranteed against faulty workmanship for a period of 2 years from the date of dispatch. Our obligation assumed under this guarantee is limited to the replacement of parts which, by our examination, are proved to be defective and have not been misused, carelessly handled, defaced or damaged due to incorrect installation.

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