Expansion of Basic System with External I/Os S5-95F
5.5 Connection of Failsafe I/O Modules
If the failsafe onboard inputs and outputs are not sufficient for your application, you can expand the
S5-95F with the following I/O modules:
• Failsafe input module DI 431-8FA..
• Failsafe output module DQ 450-8FA..
Please note that the reaction times change when you use I/O modules.
You can use the I/O modules DI 431-8FA.. and DQ 450-8FA.. both in single-channel and two-
channel operation. For safety functions, you must always use the modules in two-channel operation
and parameterize them with COM 95F.
No matter whether you operate the above-mentioned modules in single or two-channel operation,
the modules are subject to a high-grade function test.
Note
Make sure that the load voltage for all failsafe external I/O modules is connected. If the
load voltage is not connected, the S5-95F reacts with a fault message and with the
safety reaction programmed in DB1.
System Reaction to I/O Faults
The reaction to an I/O fault depends on whether you use the I/O modules in single or two-channel
operation.
When you use the I/O modules in
two-channel
operation, the S5-95F reacts as follows:
• The yellow fault LED is set
• The fault is entered into the system event DB 254
• Error OB 37 is processed
• System reaction as programmed in DB1
When you use the I/O modules in
single-channel
operation, the S5-95F reacts as follows:
• The yellow fault LED is set
• The fault is entered into the system event DB 254
• Error OB 37 is processed
• The user program is executed (no further system reaction)
5-12
EWA 4NEB 812 6210-02
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