Omni8/16C/Omni8P User Manual
UMC1480R24.pdf
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© Omniflex 2021
NOTE: The Omni16C will respond to a broadcast write sent to Address 0 if Modbus writes are
enabled regardless of the address setting of the unit. Any data write command from the Modbus
Master sent to Address 0 will be recognised by all Omni16C’s. No response will be sent.
Table 5-6 – Modbus Write Enable Setting
Modbus Write Enable Setting
SW2-5 Off
Modbus Port is Read Only. No settings or alarms
can be changed when this switch is off.
SW2-5 On
Switch this switch ON to enable the Modbus Master
to write to any registers in the Omni8/16C.
Table 5-7 – Serial Port Mode Parameters on SW2-6 to 8
SW2-6 to 8 Mode Settings
(0 = Off ; 1 = On)
6:7:8
ASCII; 9600 baud; No Parity; 7Data 2Stop
0:0:1
ASCII; 4800 baud; No Parity; 7Data 2Stop
1:0:1
ASCII; 2400 baud; No Parity; 7Data 2Stop
0:1:1
ASCII; 1200 baud; No Parity; 7Data 2Stop
1:1:1
RTU; 9600 baud; No Parity; 8Data 1Stop
0:0:0
RTU; 4800 baud; No Parity; 8Data 1Stop
1:0:0
RTU; 2400 baud; No Parity; 8Data 1Stop
0:1:0
RTU; 1200 baud; No Parity; 8Data 1Stop
1:1:0
5.10
Changing the operation of the Repeat Outputs
It is possible to change the operation of the Repeat Output relays should the application require it. In most
applications it the Repeat Outputs will repeat the inputs status of the inputs i.e. if the input is normal then
the corresponding repeat relay is energised and if the input is abnormal then the repeat relay output is de-
energised. This is the default operation.
Using the Omni8/16C Configuration Utility, the repeat relays may be setup to repeat the Alarm status of
the inputs i.e. the repeat is energised when the Alarm sequence is in the alarm condition. This is identified
as the state in which the corresponding lamp is illuminated. This is particularly useful in timer sequences
where the lamp illuminates after the input timer delay has elapsed. When the repeats are setup for alarms,
the repeats will energise when the lamp illuminates, not when the input goes abnormal.
Repeat outputs can additionally be setup for fail-safe operation. In this mode the output relay is energised
in the normal condition and de-energised in the alarm condition.
Please refer to the On-line help available in the Configuration Utility for more information.
