IM 04L20A01-01E
1-11
1
Explanation of Functions
Alarm Output Relay (/A1, /A2, or /A3 option)
If you are using a model with the optional alarm output relay, a contact signal can be
generated according to the alarm conditions. The number of contact outputs for a/A1 to /
A3 are 2, 4, and 6 respectively. The alarm output relays are indicated using [I01] to [I06]
in the alarm output settings. The following functions can be specified on the alarm
output relay.
Reflash
When multiple alarms are set to one alarm output relay, this function notifies the
succeeding alarms after the first alarm that causes the relay activation. When a
succeeding alarm occurs, the output relay temporarily turns OFF (approximately 500
ms). The initial value is set to Off (do not use). The reflash alarm function is set only
to output relays I01, I02, and I03 (I01 and I02 for /A1 option).
Alarm status
Alarm relay status
(reflash: on)
Channel 1
Channel 2
Channel 3
Output relay
(option)
Approx. 500 ms Approx. 500 ms
Alarm relay status
(reflash: off)
Output relay
(option)
(assuming I01 is assigned)
(assuming I01 is assigned)
(assuming I01 is assigned)
(I01 output)
(I01 output)
Note
If you set the reflash alarm, relays I01 to I03 become dedicated to reflash alarms regardless
of the number of alarm output relay points. Therefore, I01 to I03 operate as OR logic and
non-hold regardless of the settings made in “AND/OR of alarm output relays” and “Hold/Non-
hold operation of the alarm output relay” on the next page.
AND/OR of Alarm Output Relay
When sharing an alarm output relay among multiple alarms, you can select from the
following conditions that cause the alarm output relay to be activated.
• AND: Activated when all alarms are being generated simultaneously.
• OR: Activated when at least one of the alarms is being generated.
Alarm status
Channel 1
AND
Channel 2
OR
Alarm relay status
Specify the alarm output relay to operate under the AND condition as in [I01 (first
relay) to Ixx (where xx is the relay number)].
Note
If the reflash alarm is turned ON, I01 to I03 are set to OR logic operation. Specifying AND
produces no effect.
1.3 Alarm Function
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