Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual page 112

Fail-Safe Modules
7.5 4/8 F-DI DC24V PROFIsafe Digital Electronic Module
Reintegration After Discrepancy Error Parameter
With this parameter you can define the criteria for clearing discrepancy errors which, when
fulfilled, facilitate reintegration of the relevant input channels. Programming options:
● "Zero signal test required" or
● "Zero signal test not required"
Requirements
Parameter settings:
● Sensor evaluation: "1oo2 evaluation"
"Zero signal test required"
When "Zero signal test required" is set, a discrepancy error is not considered cleared until a
zero signal is set at both input channels.
When using nonequivalent sensors, that is, "2-channel nonequivalent" is set at the "Type of
sensor interconnection" parameter, the zero signal must again be set at the channel which
provides the wanted signal.
"Zero signal test not required"
When "Zero signal test not required" is set, a discrepancy error is considered cleared when a
discrepancy no longer exists between the two input channels.
SIMATIC S7 F-modules, for which you cannot program the "Reintegration after discrepancy
error" parameter, also behave in this way.
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ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07