Page 22 - GuardII+ Series 4208 Platform User Manual

GuardII+ Operation

The technology-specific User Manuals will provide Modbus details for each technology.

4.5. GuardII+ Alerts

When running measurements, GuardII+ analyzes the data to determine if the Alert needs
to be asserted; the exact analysis is different depending on the specific monitoring technology.
The Alerts of each technology are tracked separately.

NOTE:
There are two types of configurations that need to be completed using IAM
for the Alert feature to function fully:

• First, there is a global Alert Relay behavior that must be set to a
selection other than ‘Disabled’; if the Alert Relay behavior is not
configured, then the Alert Relay will not function, although Archived
measurements and Modbus data will still report an Alert condition
when it occurs.
• Second, each monitoring technology has its own setup for the Alert
function.

4.5.1. Alert Relay
GuardII+ is equipped with a solid-state Alert Relay that can be programmed with one of
five behavior options using IAM:
• Disabled – the Alert Relay is not used.

• Normally Open, Latching – if there is no Alert condition, the relay contacts are open.
When an Alert is detected, the relay will close and stay closed until reset.

• Normally Open, Momentary – if there is no Alert condition, the relay contacts are open.
When an Alert is detected, the relay will close for 4 s and then automatically open
again.
• Normally Closed, Latching – if there is no Alert condition, the relay contacts are closed.
When an Alert is detected, the relay will open and stay open until reset.
• Normally Closed, Momentary – if there is no Alert condition, the relay contacts are
closed. When an Alert is detected, the relay will open for 4 s and then automatically
close again.

Refer to Section 5.13 for details on connecting the Alert Relay.

4.5.2. Alert Modbus Registers
Alerts are also reported over Modbus as described in Section 9.3. This information is
updated after the Alert state of any monitoring technology changes. The Alert registers
provide the following information:
• The current state of the Alert Relay (open or closed).
• The overall Alert status of the monitor (no Alert, Alert or Alert test mode active).

• The Alert status of each monitoring technology.

16
www.irispower.com