Hitachi SJ Series - Release of Safety State

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Chapter 4
Safety Function
4.7 Release of safety state
4.7.1 Release of STO (SS1/SBC)
Time chart of release of STO state is shown as below. Below
example is as STO function. STO state is released by SS1
signal releasing after SS1 completed or SBC signal releasing
after SBC completed.
■Timing chart
e.g. [1-12]STO-A Release Mode = 00(Without release):
e.g. [1-12]STO-A Release Mode =01(With safety signal):
e.g. [1-12]STO-A Release Mode =02(With release signal):
*) Setting of [1-12]STO-A Release mode is available to
release the signal of ‘-A’. Setting of [2-12]STO-B Release
mode is available to release the signal of ‘-B’.
STO-A
STO-A
monitoring
STO-A
Open
Short
Active (during STO Keep time)
Inactive
Active
Inactive
Release
Input
Outp
STO-A
STO-A
monitoring
STO-A
Open
Short
Active(
during
STO Keep time)
Inactiv
e
Active
Inactive
Releasable
Input
Outpu
t
STO-A Input
STO-A monitoring
STO-A completed
Open
Short
Active(during STO Keep time)
Inactiv
e
Active
Inactive
Releasable
With release signal
Active
Inactive