TXP CLC Course
9
TXP
Function Block
FB71 (CBO)
General Description
The processing of binary output signals in the TXP AS 620 B system (SIM
version) is carried out using a CBO function block (FB71) in conjunction with an
ET 200M I/O device (SIM 322 and/or 323). The BT function block and SIM
modules are used to:
• Provide the binary output signal
The BT function block establishes the connection between the hardware function
plans and the automation processor (AP) logic. It is used to establish a binary
signal for output from the process control.
In normal operation, the CBO 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).
The signal must be defined (SIGDEF) on the individual level logic diagram
(function plan / YFR) that is identified with the Power Plant Identification Code
(KKS) for the equipment. The signal is then available for use as an output to the
field device. The SIGDEF and KKS must match the output channel identifier in
the parameter mask of the SIM module on the rack level location drawing for the
connection to the output point.
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