Woodward MRM4, Manual, Page: 64 / 460

Input, Output and LED Settings
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»Hold time« : At signal changes, the minimal latching time ensures that the relay will be maintained
picked-up or released for at least this period.
If binary outputs are parametrized » Latched= active«, they will keep (return
into) their position even if there is a break within the power supply.
If binary output relays are parametrized » Latched= active«, The binary
output will also retain, if the binary output is reprogrammed in another way.
This applies also if
» Latched is set to ina ctive« . Resetting a binary output
that has latched a signal will always require an acknowledgement.
The »System OK Relay« (watchdog) cannot be configured.
Acknowledgment options
Binary output relays can be acknowledged:
•
Via the push-button »C« at the operating panel;
•
Each binary output relay can be acknowledged by a signal of the »assignment list« (If » Latched is
active« );
•
Via the module »Ex Acknowledge« all binary output relays can be acknowledged at once, if the signal for
external acknowledgement that was selected from the »assignment list« becomes true. (e.g the state of
a digital input).
•
Via SCADA, all output relays can be acknowledged at once.
Page 64 EN MRM4 01/11