My total programming knowledge is what I have learnt on the online tutorial and trying to mess with free downloads such as AB Picosoft6.
What I am trying to do is replace a 555 timer circuit which uses external pots (variable resistors) to control both the on and off times of a relay. For a PLC I dont mind the the on time being programmed in but I want the off time to be varied either with the pot feeding an analogue input or possibly use a digital encoder. Most plcs seem to offer plenty of timer and counter functions but I can get my head around how to program them together to produce the cycling output I am look for. Can anyone point me to some examples. Thanks
What I am trying to do is replace a 555 timer circuit which uses external pots (variable resistors) to control both the on and off times of a relay. For a PLC I dont mind the the on time being programmed in but I want the off time to be varied either with the pot feeding an analogue input or possibly use a digital encoder. Most plcs seem to offer plenty of timer and counter functions but I can get my head around how to program them together to produce the cycling output I am look for. Can anyone point me to some examples. Thanks