F_Ch_Di - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
8.2.1

F_CH_DI

Function
The block reads the digital value of the input channel whose symbolic name is
linked to the input VALUE from the associated F module driver (F_M_DIx). The F
module driver has read the digital value via a safety frame from the digital input
module (or possibly a module that is redundant to this one). The connection to the
associated F module driver (F_M_DIx) is automatically established by means of the
interconnection at the input CHADDR.
If the digital value is valid, it is made available at the output Q.
If the digital value is invalid, the substitute value 0 is output at the output Q. For the
reintegration of a 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 output Q.
For the process value at the output Q, a value status (quality code) is generated at
the output QUALITY that can take on the following states:
State
Valid value
Simulation value 16#60
Substitute value
I/Os
Inputs:
8-10
Quality Code
16#80
16#48
Name Data Type Explanation
ADDR_CODE DWORD
CHADDR F_WORD
VALUE BOOL
SIM_I F_BOOL
SIM_ON F_BOOL
PASS_ON F_BOOL
ACK_NEC F_BOOL
ACK_REI F_BOOL
Address code for VALUE
interconnection
Address of the channel in the F
module driver
Must be interconnected with the
symbolic address of the channel
from HWCONFIG across the
margin of the chart
Simulation value
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
Interconnected
automatically
0
0
0
0
0
0
Fail-Safe Systems
A5E00085588-03