Woodward highprotec MRI4, User Manual

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Input, Output and LED Settings
If binary outputs are parameterized
»Latched=active«,
they will k
eep (return
into) their position even if there is a break within the power supply.
If binary output relays are parameterized »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 inactive«. 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.
Relay output contacts can be set by force or disarmed (for commisioning support,
please refer to the „Service/Disarming the Output Relay Contacts“ and
„Service/Forcing the Output Relay Contacts“ sections).
82 MRI4 DOK-HB-MRI4-2E