4-5
Chapter 4
Safety function
4.7 State Display Function
STO inputs status can be displayed on the operator keypad
by configuring the parameters listed in the table below.
It can be also confirmed on the monitor parameter [dA-45].
■
List of parameter related to
STO display function
Contents of display, monitor and the interruption of output
by a trip are non-safety function (not certified as safety-
related function).
Item
Parameter
Data
Description
STO input display
selection
[bd-01]
00
“STO” is displayed on the operator keypad when both ST1 and ST2
signals are STO (ST1=ST2=OFF).
01
“STO” is NOT displayed on operation panel screen even both ST1
and ST2 are STO (ST1=ST2=OFF).
02
E90 is generated when both ST1 and ST2 are STO (ST1=ST2=OFF).
STO input switch
allowable time
[bd-02]
0.00
～
60.00(s)
Allowable time for inconsistent Input states of ST1 and ST2
(i.e. ST1=on and ST2=off).
When 0.0 is set, tolerance in timing is deactivated.
STO display selection
within allowable input
time
[bd-03]
00
Warning message is displayed while ST1 and ST2 are discrepant for
the period defined by [bd-02].
01
Warning message is NOT displayed even while ST1 and ST2 are
discrepant for the period defined by [bd-02].
STO behavior selection
after expiration of
input allowable time
[bd-04]
00
Warning message is displayed when inconsistency of STO inputs
continues more than the time defined by [bd-02]
01
Warning message is NOT displayed even when inconsistency of STO
inputs continues more than the time defined by [bd-02]
02
Trips with an error [E092] or [E093] when inconsistency of STO
inputs continues more than the time defined by [bd-02]
