Siemens SIMATIC S7-1200

Fail-Safe signal module (SM) I/O configuration
5.5 Configuring SM 1226 F-DQ 2 x Relay DQ and channel parameters
S7-1200 Functional Safety Manual
114 Manual, 02/2015, A5E03470344-AA
5.5
Configuring SM 1226 F-DQ 2 x Relay DQ and channel parameters
Table 5- 6 SM 1226 F-DQ 2 x Relay DQ parameters
DQ parameters
Description
Default
Options
Relay continuous on time
limit
Maximum number of days that the relay can
remain continuously on before automatic pas-
sivation.
Whenever the relay cycles from the de-
energized to energized state, the number-of-
days calculation begins again.
Note: The 30-day default is the maximum test
frequency for SIL 3/Category 4 applications.
You can extend the test frequency for SIL
2/Category 3 applications for this product to as
much as 366 days.
30 1 to 366 days
Table 5- 7 SM 1226 F-DQ 2 x Relay channel parameters
Channel parameters
Description
Default
Options
Activated Select the check box to activate the channel.
Deselect the check box and the unused
channel is deactivated.
If you deactivate a channel, you also deacti-
vate its diagnostic function.
Check box se-
lected
Check box:
• Selected
• Deselected
Channel failure
acknowledge
Controls whether the channel is automatically
reintegrated after a fault clears, or requires an
acknowledgement (manual) in the user pro-
gram. Refer to "Reactions to faults"
(Page 115) for the reintegration procedure.
Manual Not configurable