Yokogawa EXAxt PH450 4-Wire Analyzer for pH and ORP - Manual (Page 40)

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IM 12B07C05-01E
5-9. Fail
A fail contact is energized when a fail situation
occurs. Fail situations are configured in section
5-10. For SOFT Fails the contact and the dis-
play on LCD are pulsating. For HARD Fails the
contact and the display on LCD are energized
continuously.
Only contact S4 is programmed as a fail-safe
contact. This means that contact S4 will be
de-energized when a fail situation occurs.
The contact reacts to Hard Fails Only
The contact reacts to Hard and Soft Fails
5-10. Simulate
The contact can be switched on/off or a
percentage of output can be simulated. On/Off
enables the user to manually switch a contact
on or off. The percentage is an analogue value
and represents the on time per period.
The Duty cycle Period time (see figure 5-4) is
used as a period for percentage simulation.
Note that the (simulated) settings of the con-
tacts become visible in measuring mode and
after HOLD has ended c.q. has been overruled.
A warning is activated in case of a simulated
output contact.
Hard Fail Only
Hard + Soft Fail