Sim Function Block; General Description - Siemens TXP-CLC Manual

TXP

SIM Function Block

FB70 (BT)

General Description

The processing of binary signals in the TXP AS 620 B system (SIM version) is
carried out using a BT function block (FB70) in conjunction with an ET 200M I/O
device (SIM 321 and/or 323). The BT function block and SIM modules are used
to:
•
Provide the supply voltage for 8 changeover contacts (Form C)
•
Condition the sensor signal
•
Monitor the input signal
•
Simulate the logical sensor signal
•
Output signal faults and channel faults
The BT function block establishes the connection between the hardware function
plans (YDR) and the automation processor (AP) logic (YFR). It is used to
establish a binary signal for use in monitoring and/or process control.
In normal operation, the BT references the value of the input signal from the
Process Image Input Table (PAED), conditions it and writes it into the status data
block (ZUDB).
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 in the AP. The
SIGDEF and KKS must match the input channel identifier in the parameter mask
of the SIM module on the rack level location drawing for the connection to the
input point.
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