F_Ch_Do - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
8.2.2

F_CH_DO

Function
The F channel driver makes the process value at the input I available to the
associated F module driver (F_M_DOx). The F module driver reads the value from
the F channel driver F_CH_DO and writes it via a safety frame to the channel of
the digital output module addressed via the output VALUE (and possibly of a
module that is redundant to this). The connection to the associated F module driver
(F_M_DOx) is automatically established by means of the interconnection at the
output CHADDR.
If the F channel driver detects at the next call that errors have occurred, the
substitute value 0 is made available for the associated F module driver at the next
call instead of the process value at the input I. For the reintegration of the process
value after an error is corrected, a user acknowledgment is required depending on
the parameterization and error type.
Alternatively, a simulation value can be output at the module output if there is no
error.
For the digital value I output to the module, a value status (quality code) is
generated at the QUALITY output that can take on the following states:
State
Valid value
Simulation value
Substitute Value
I/Os
Inputs:
Fail-Safe Systems
A5E00085588-03
Quality Code
16#80
16#60
16#48
Name Data Type Explanation
ADDR_CODE DWORD
I F_BOOL
SIM_I F_BOOL
SIM_MOD F_BOOL
SIM_ON F_BOOL
PASS_ON F_BOOL
ACK_NEC F_BOOL
ACK_REI F_BOOL
Address code for VALUE
interconnection
Process value
Simulation value
1=Simulate I/O Module
1= activate simulation value
0= deactivate simulation
value
1= activate passivation
0= deactivate passivation
User acknowledgment for
reintegration after error
1 = required
0 = not required
Reintegration
acknowledgment
Default
Supplied
automatically
0
0
0
0
0
0
0
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