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com_watchdog

Com Watchdog

Com Watchdog

Enable Communications Monitoring When Checked the SS20 will monitor the data traffic through the device and provide relay indication when communications fail for longer than the specified timeout.
Direction If direction is set to “Request” the watchdog timer will be reset by applicable data coming in the input port. If set to “Response” the watchdog timer will only be reset when a response comes back from the slave device.
Msg Type If set for “Any Unblocked Data” the watchdog timer is reset by any data passing through the SS20 (data blocked by the Address Blocking functions in the SS20 will not reset the watchdog timer)
If set to “Specified Address Only” only messages with the specified address will reset the watchdog timer.
Address If message type is set to “Specified Address Only” this sets the address that will reset the watchdog timer. If monitoring for an address which is translated using the address blocking/translation features of the SS20, use the incoming address in this field.
Timeout Sets the amount of time the watchdog timer will wait before indicating a communications failure.
Unit Sets the units for the preceding “Timeout” value. Options are Seconds, minutes, hours, or days.
Detect Com fail when: Trigger Relay indication when communications from COM1 or COM2 fail or a combination of either port (COM1 or COM2) failing or both ports (COM1 and COM2) both fail.
Com Fail Indication: Determines the operation of the Com Fail Relay, there are three modes of operation:

1. Drop Relay – The relay is energized during normal operation (NO closed, NC open) and de-energizes if a com failure is detected (Fail Safe Operation). Relay will re-energize after communications are re-established.

2. Pulse Relay – The Relay is energized during normal operation (NO closed, NC open) and drops for 10 seconds when a com failure is detected. After the 10 second period the relay re-energizes. This allows the relay to power cycle communications equipment and automatically bring them back online.

3. Toggle Relay – During normal operation the relay is continuously toggling at a rate of 2Hz (one second on, one second off), when a com failure is detected the relay stays off (NO open, NC Closed) until communications are re-established.
com_watchdog.txt · Last modified: 2017/07/23 14:01 by dmeier