Siemens TXP-CLC Manual page 147

TXP
Function Block
FB75 (CAO)
General Description
The processing of analog signals in the TXP AS 620 B system (SIM version) is
carried out using a CAO function block (FB75) in conjunction with an ET 200M
I/O device (SIM 321 and/or 323). The CAO function block and SIM modules are
used to:
•
Provide the analog output signal at the hardware module
•
Linearize the signal to 4 to 20 mA
The CAO function block establishes the connection between the hardware
function plans and the automation processor (AP) logic. It is used to establish an
analog signal from the process control.
In normal operation, the CAO references the value of the output signal from the
status data block (ZUDB), conditions it and writes it into the Process Image
Output Table (PAAD).
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