Siemens S7-400PLC Spécifications Page 119

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Digital modules
4.8 Digital input module SM 421; DI 16 x DC 24 V (6ES7421-7BH01-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
119
Behavior when the input delay equals 0.1 ms or 0.05 ms and an error occurs
If you have set the following parameters:
Input delay: 0.1 ms or 0.05 ms
Reaction to error: "Keep Last Value" (KLV) or "Substitute Value" (SV)
Set substitution value "1"
In the event of a fault on a channel that has a 1 signal, the following could occur:
A 0 signal may be briefly output
If configured, a hardware interrupt may be generated.
This occurs before the last valid value or substitute value "1" is output.
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