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Chapter 4
Configure the Base 857 Relay
External Analog Outputs for
857-RAD Scanner
26
Table 9 - 857-RAA/RAD External I/O Registers
RTD Channel 1 resistance
RTD Channel 2 resistance
RTD Channel 3 resistance
RTD Channel 4 resistance
RTD Channel 5 resistance
RTD Channel 6 resistance
RTD Channel 7 resistance
RTD Channel 8 resistance
RTD Channel 9 resistance
RTD Channel 10 resistance
RTD Channel 11 resistance
RTD Channel 12 resistance
(1)
mA-input 1
(1)
mA-input 2
(1)
mA-input 3
(1)
mA-input 4
(1)
PTC-resistance
(1)
mA-output 1
(1)
mA-output 2
(1)
mA-output 3
(1)
mA-output 4
(1) 857-RAD only.
The 857-RAD scanner is equipped with four individual isolated analog
outputs. If used, these outputs must be configured within the base relay for
proper operations. Each analog output has a fully configurable output current
range. Typical range configurations would be 0...20 mA or 4...20 mA. More
dynamic ranges like 0...1 mA, 0...5 mA, or 10...20 mA can be configured freely
as long as the boundary values are within the 0...20 mA range.
Rockwell Automation Publication 857-UM002C-EN-P - February 2018
Modbus Register
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
Properties
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read
Read / Write
Read / Write
Read / Write
Read / Write
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