Internet PLC Forum

I have a program that drives a stepper motor. it works fine on the simulation - ie generates the expected speed and direction. When I try to it on the PLC, the clock frequency is nowhere near where it should be- and the motor turns at around 30pps if set at 10 or 20 or 50 or 70 etc.. This occurs even if the motor and driver is not connected  and I measure between the positive and output 5 When asking for higher pulse rates, say around 200 + I get around 110 or so. This occurs even if the motor and driver is not connected  and I measure between the positive and output 5.