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Manual Documentation Number: RT-12 series-4006m 39
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
RTU Alarms
The RT series RTU’s have several types of
alarms. Below is a description of each alarm. To
modify or change any of the alarms, click on the
respective box or boxes, and press the “Send
Parameters To Device”. Make sure you are
“Connected”. Alarms are local to the RTU. Each
RTU has a built in beeper alarm. Most alarms
will sound at the master as well as the slave units.
Most of the alarms apply even in Modbus mode.
Update On Change: Not used at this time and is used
for future enhancements.
Alarm On Comm Fail: If enabled, will sound an
alarm on a Local RTU Level. If in peer to peer mode,
the alarm may sound at the Master as well as the Slave.
A communications failure is determined by repeated,
consecutive, failed attempts made by the Master to
contact the Slave unit. The number of attempts made
depends on the parameter “Retries”. The slave unit
defaults to a 20 second time out if it does not make
contact with the Master.
Set Rest Voltage on Comm Error: If enabled, will cause a local and remote alarm if
a communications failure occurs. This will also force the analog outputs to the
programmed “Analog Resting Voltages” and if enabled will cause the discrete output
to be set to an active high or active low state. “Alarm On Comm Fail” must also be
enabled. In Modbus mode, the comm. fail delay time is 2 minutes.
This parameter also applies if the respective RTU is configured as a Modbus Slave
device.
Alarm On Input Voltage Limit Error: If enabled will cause a local and remote
alarm if the main input voltage falls below or rises above your set limits. These limits
are located in the same section “Analog Resting Voltages”. This alarm will not affect
any of the outputs; the alarm will cause an audible alarm.
40 Manual Documentation Number: RT-12 series-4006m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
Alarm On Main Power Supply Failure: If enabled will cause a local and remote
alarm if the main input voltage completely fails. The backup battery MUST be
connected for this function to operate properly or a communications failure will occur.
This alarm will not affect any of the outputs; the alarm will cause an audible alarm.
Discrete Output-1 Comm Fail Output: If enabled and a communications alarm occurs,
this parameter will cause DO-1, on all RT series RTU’s, to become “Active High” or
“Active Low”. The Output level will depend on how the output is configured. If
enabled, this output can not be controller in peer to peer or Modbus mode. This feature
was added to notify other equipment of a communications failure. This feature may
also be used to activate an external auditable or visual alarm, such as a Horn or Light.