Annunciator Sensor
2010
HELP! plc lab assignment and I am confused???
There are four sensors to an annunciator system that switches the output ON if some operational malfunction occurs. Design a program tha operates the alarm system as follows:
1. if any one input is ON nothing happens
2. if any two inputs are ON, a green pilot light goes on
3. if any three inputs are ON, a yellow pilot light goes ON
4. if any four inputs are ON a red pilot light goes ON
5. Interlock the lights so that there is only one pilot light ON at a time
If it is A-B PLC I would do the following (assuming the inputs are on I:1/0 – I:1/3 and green light = O:2/0, yellow = O:2/1, red = O:2/2)
CLR N7:0;
XIC I:1/0 ADD N7:0 1 N7:0;
XIC I:1/1 ADD N7:0 1 N7:0;
XIC I:1/2 ADD N7:0 1 N7:0;
XIC I:1/3 ADD N7:0 1 N7:0;
EQU N7:0 2 OTE O:2/0;
EQU N7:0 3 OTE O:2/1;
EQU N7:0 4 OTE O:2/2;
system test 11
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