Rockwell-automation T3470A ICS Regent Analogue Output Modules User Manual download pdf (Page 2)

Analog Output Modules

(T3470A)

Industrial Control Services

module from affecting module operation). The voted result is

then passed to the I/O bus interface logic.

The voted output data from the I/O bus interface logic is then

used to drive individual digital

analog (D/A) converters per

output channel. The field

side D/A output circuits are

optically isolated from the I/O bus interface logic circuits and

receive power from the external power supply.

Each D/A output circuit provides a 4 to 20 mA output current

corresponding to analog output values ranging from 0 to

4095. The analog output circuits are capable of driving

external load devices up to 500 Ohms.

Figure

. Block Diagram of Analog Output Module.

Testing and Diagnostics

Each module’s voter circuits are periodically tested by the

processor modules. Discrepant data are sent through one of

three legs of the I/O Safety

bus to determine whether the

module’s voter is able to outvote the incorrect data. A failure

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Rockwell-automation T3470A ICS Regent Analogue Output Modules User Manual Page 2