Related Manuals for Omega DRA-DCC-8
Summary of Contents for Omega DRA-DCC-8
- Page 1 User’s Guide http://www.omega.com e-mail: info@omega.com DRA-DCC-8 DIGITAL TO 8 CURRENT LOOP CONVERTER...
- Page 2 OMEGAnet http://www.omega.com USA: One Omega Drive, Box 4047 ISO 9001 Certified Stamford, CT 06907-0047 Tel: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM Customer Service: 1-800-622-2378 / 1-800-622-BESTSM Engineering Service: 1-800-872-9436 / 1-800-USA-WHENS M TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA Mexico and Latin America:...
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Page 3: Table Of Contents
Contents 1. MOUNTING INSTRUCTIONS 2. REPLACING FUSES 3. ASSEMBLY 4. SUPPLY VOLTAGE 5. MODES OF OPERATION 5.1 0-20 or 4-20mA output current selection 5.2 Switch Settings 6. PARALLEL CONTROL MODE 6.1 PLC Interface 6.2 The "E" (ENABLE) Terminal 7. SERIAL CONTROL MODE 7.1 RS232c / RS422 Select 7.2 RS422 Termination 7.3 Serial Control Switch Settings... -
Page 4: Mounting Instructions
1. MOUNTING INSTRUCTIONS The DRA-DCC-8 is designed for standard DIN rail mounting. Place the unit on the upper part of the mounting rail with the fastening tab facing down. Using a suitable flat screwdriver loosen the tab slightly and attach the unit to the rail. -
Page 5: Supply Voltage
4. SUPPLY VOLTAGE The DRA-DCC-8 is powered by a DC power supply at a range of 15-32Vdc. In order to determine the minimum supply voltage, use the following equation: Vmin = 8 + Rload( ) * 0.02 where: Vmin is the minimum required supply voltage. -
Page 6: Parallel Control Mode
PARALLEL MODE * according to para #5.2 In the parallel control mode, the DRA-DCC-8 unit is controlled via a 15 bit bus. Three Address bits (A0-A3) select the proper current output channel and 12 Data bits (D0-D11) determine its value (A0 and D0 are MSB). The DRA-DCC-8 microprocessor continuously scans the input vector (Address + Data) terminals and updates its memory tables upon recognizing a new vector. -
Page 7: The "E" (Enable) Terminal
The SW8's ON state terminates the RS422 receiver terminals with a 100 load. In a multidrop configuration, the last (most distant) DRA-DCC-8 unit should be terminated in order to match the transmission lines. Note: Only one termination load per RS422 communication link is permissible. -
Page 8: Baud Rate Select
The host computer sends a massage and does not receives an acknowledgment. With echo back The host computer sends a message and receives an acknowledgment stating the DRA-DCC-8 ID number and the addressed channel number. Status report 7.4.3.1. WITHOUT ECHO BACK FORMAT [A] [ID CODE] [CHANNEL VALUE] [CR] The character A begins the command block. -
Page 9: Self Test Modes
Note: If the value is omitted it will be treated as zero. Separators such as blanks or commas are not allowed. Example: Channel 4 in DRA-DCC-8 no. 7 has to receive the value of 981. Echo back is required The command format is: [C] [7] [4] [981] [CR]... -
Page 10: Self Test
Baud rate : 4800, Word length: 8 bits, Parity: even, Stop bit: 1 8.2 SELF TEST #2 (Same Leve)l In this test mode, the DRA-DCC-8 unit ignores the address field. All the outputs are set according to the data field only. -
Page 11: Calibration
0 and voltages from 4V to 60V as logical 1. 11. DRA-DCC-8 CALIBRATION Generally there is no need to calibrate the DRA-DCC-8 unit. However if calibration is required, the following steps should be carried out: Two potentiometer trimmers, one for "Zero" and the other for "Span" are located on printed card 7040. The trimmer close to the card edge is the "Zero". -
Page 12: Specifications
12. SPECIFICATIONS INPUTS: PARALLEL INPUTS LOGIC LEVELS: DATA HOLD TIME: MAXIMUM PARALLEL INPUT RATE: SERIAL COMMUNICATION BAUD RATES: PARITY: STOP BIT: STATUS REPORT: MULTIDROP CAPABILITY: OUTPUTS: OUTPUT CURRENT SPAN: OUTPUT CURRENT SETTLING TIME: POWER SUPPLY: CURRENT CONSUMPTION: MAXIMUM LOOP RESISTANCE: ACCURACY: RESOLUTION: INDICATORS:... -
Page 13: Specifications
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. - Page 14 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors Infrared Pyrometers PRESSURE, STRAIN AND FORCE Transducers &...