Hello, I have an application running with a T100MD888 and a Maple Systems HMI connected via 2 wire RS485. The HMI is set to the default communication protocol on the PLC.
The communication works well but every once in a while randomly the com light goes out on the HMI, after a second or two it comes back on. This may happen once or twice or continuiously on and off.
This is somewhat problematic because in this application the plc sends commands to a Delta Systems motion controller that hydraulically positions an indexing setworks bar for a wood edger. If the operators select a size on the HMI while the com light is out, the plc does not receive the command until the com light goes back on. If the operator has already fed a piece of lumber into the edger saw and the bar moves, the saw could be damaged badly.
What I need is to solve this problem, what I have found is after system starup the com light usually stays lit for some time, this can be 30 min or 2 hours, it is random. Once the com light starts to flicker, if I turn the system power off and then on, the problem goes away.
Should I try different communication speeds to get rid of this. Or can suggest anything else.
Thanks
Will Steed