The following describe how to implement simple alarms in a PLC.
We used a MICRO PLC TSX3722 and a card
TSXDMZ28DR (16Inputs/12Outputs) but any PLC could be used.
We used a MICRO PLC TSX3722 and a card
TSXDMZ28DR (16Inputs/12Outputs) but any PLC could be used.
Here is the electrical drawing
The implementation on the PLC is for each input . 2 Inputs used for this example.
The following images showing how to implement the HORN and the LIGHT signalling.
As the figures shows the auxiliarys bits are for the Horn indicator and the Alarm Inputs are for the LIGHT indicator. The programmer can also add as many alarms as he wish to this rungs either directly or as a sum of alarms. It is left to programmer how to achieve this, but consider the limitation of the rung when using a PLC like the MICRO As you could see there are 7 vertical and 11 horizontal positions. In the figures several inputs as alarms (errors - thermal relay etc) and auxiliaries added to demonstrate how to add more than 7 vertical contacts.