I'm using a resistive networked matrix keyboard, which is interfaced to 3 of the ADC inputs of a 1616 PLC, and most of the time the configuration works well. But it seems that when I initiate either one of two sequencers in my program, all three ADC ports just 'freeze' for no apparent reason!
Using the 'Online monitoring' facility I can easily monitor the ADC input levels, and these are seen to just 'freeze' when I activate a sequencer from the keyboard, and therefore the keyboard becomes inactive and useless. However, when I advance the sequencer via the 'Online monitoring' simulator, everything then jumps back into life???
Can you please throw some light on why this is happening? Is this maybe a bug within the PLC's operating system? Any assistance would be much appreciated. Thanks.