Rev 4.9
SignalFire Telemetry
19
Additional Options
There are two check boxes for additional logic options.
Failsafe Enabled
– If this option is selected
all
rules must have valid data for the relay to be energized. If one
or more of the nodes times-out or does not exist the relay will be de-energized.
If this option is not selected, then a node that is not installed or fails to check in will be ignored and the relay
will be energized using logic only from the units that are active.
Latch De-Energized
– If this option is selected the rules may only de-energize the relay. For the relay to be
energized again a Modbus write from a PLC to the gateway for the destination Counter stick relay must occur.
This is useful if manual intervention is required before the relay is energized after an event. In the example
above, a Modbus coil write to Modbus ID 5 relay channel 1 (which is register 1) is required to energize the
relay. See the RSD Stick manual for a detailed register map.
The “Normal” state of the relay or digital output is the un-energized state and this state should be used to
set the controlled system (pump, motor,…) in the “safe” or “off” state.
Output Modules
With the purchase of a SignalFire Analog Output Module or Digital Output Module, the Gateway can directly
control analog (4-20mA, 1-5V) and digital outputs. The outputs for the module can be controlled through the
“Analog/Relay Output Module” window under the Settings menu.
Further information on the modules can be found in their respective manuals.
