Siemens Simatic M7-400 Reference Manual page 162

Digital Modules
Behavior when the Input Delay Equals 0.1 ms and an Error Occurs
If you have parameterized the following:
• An input delay of 0.1 ms or 0.05 ms
• KLV or SV as the response to an error
• Substitute "1"
In the event of a fault on a channel that has a 1 signal, the following could occur
before the last valid value or the substitute value "1" is output:
• An 0 signal may be briefly output
• If parameterized, a hardware interrupt may be generated
4-40
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07