Configuring Do Channels (Digital Output Channels) - YOKOGAWA GX20 User Manual

1.6 Configuring DO Channels (Digital output channels)
Explanation
1-78
Reset
Alarm 1
Alarm 2
Activated
Alarm output relay
Deactivated
Relay deactivated interval
Set the relay's not-active interval for reflash operation.
AND/OR Operation
When multiple alarms are assigned to one alarm output relay, you can select which condition
below will activate the output relay. You can also specify AND operation for internal switches.
• AND: Activated when all assigned alarms are occurring simultaneously
• OR: Activated when any of the specified alarms is occurring
Reflash
When multiple alarms are assigned to one alarm output relay, this function notifies the
occurrence of subsequent alarms after the relay is activated by the first alarm. When
subsequent alarms occur, the output relay is released temporarily. The duration for which the
relays are deactivated can be set to 500 ms, 1 s, or 2 s.
Relays set to Reflash will operate using Or and Nonhold settings.
Energize or De-energize Operation
You can select whether the alarm output relay is energized or de-energized when an alarm
occurs. If you select de-energize, the alarm output relays will be in the same state when the
GX/GP is shut down as they are when an alarm occurs.
Nonhold/Hold
The alarm output relay can be set to operate in the following fashion when the alarm
condition is no longer met.
• Turn OFF the relay output (nonhold).
• Hold the relay at ON until the alarm ACK is executed (hold).
Alarm ACK Operation
Acknowledging all Alarms
The alarm acknowledge (alarm ACK) operation releases all alarm indications and relay
outputs.
Acknowledging Individual Alarms (Release number 2 and later)
Individual alarm ACK operation releases specific alarms.
For the behavior of alarm indication and alarm output relay when you execute an alarm ACK
operation, see the next page.
Alarm ACK
Occurrence
Occurrence
Relay is activated on the next alarm occurrence.
IM 04L51B01-01EN