High-Speed Input and
Pulse Output Features
3–43
High-Speed Input and Pulse Output Features
4. Wiring – Verify the wiring to the stepper motor is correct. Remember the
signal ground connection from the PLC to the motion system is required.
5. Motion system – Verify that the drive is powered and enabled. To verify the
motion system is working, you can use Mode 60 operation (normal PLC
inputs/outputs) as shown in the test program below. With it, you can
manually control Y0 and Y1 with X0 and X1, respectively. Using an input
simulator is ideal for this type of manual debugging. With the switches you
can single-step the motor in either direction. If the motor will not move with
this simple control, Mode 30 operation will not be possible until the problem
with the motor drive system or wiring is corrected.
SP0
LD
K60
Load constant K60 into the accumulator. This
selects Mode 60 as the HSIO mode.
OUT
V7633
Output the constant to V7633, the location of the
HSIO Mode select register.
DirectSOFT
Mode 60
OUT
V7635
Output this constant to V7635, configuring X1.
Filtered Inputs
OUT
V7636
Output this constant to V7636, configuring X2.
LD
K1006
Load the constant K1006 which is required to configure
filtered inputs with a time constant of 10 mS.
OUT
V7634
Output this constant to V7634, configuring X0.
END
END coil marks the end of the main program..
X0
OUT
Use a switch on X0 input to manually control output Y0.
Y0
X1
OUT
Use a switch on X1 input to manually control output Y1.
Y1
6. Memory Error – HSIO configuration parameters are stored in the CPU
system memory. Corrupted data in this memory area can sometimes
interfere with proper HSIO operation. If all other corrective actions fail,
initializing the scratchpad memory may solve the problem. With
DirectSOFT, select the PLC menu, then Setup, then Initialize Scratchpad.
Symptom: The motor turns in the wrong direction.
Possible causes:
1. Wiring – If you have selected CW and CCW type operation, just swap the
wires on Y0 and Y1 outputs.
2. Direction control – If you have selected Pulse and Direction type
operation, just change the direction bit to the opposite state.
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