Instruction Manual

MAN0883-05-EN CH.11
March 4, 2010 Page 59 of 135 #1037
Error
A high indication on this register (%I31) indicates that one of the analog parameters
specified above is invalid or the stepper action was aborted before the operation was
complete. This register is cleared on the next start command if the error was corrected.
The stepper requires one discrete register (%Q1) to control the stepper action. Setting this
register starts the stepper cycle. This register must remain set to complete the entire cycle.
Clearing this register before the cycle is complete aborts the step sequence and sets the error bit.
Note that setting the PLC mode to Stop while the stepper is in operation causes the
stepper output to immediately drop to zero and the current stepper count to be lost.
Note that stepper output level may cause damage or be incompatible with some motor
driver inputs. Consult drive documentation to determine if output level and type is
compatible.
11.5 PWM functions register map
Register PWM HSC Stepper
%AQ1 Start Frequency
%AQ2
PWM1 Duty Cycle (32-
bit)
HSC1
Preset Value
Run Frequency
%AQ3
%AQ4
PWM2 Duty Cycle (32-
bit)
HSC2
Preset Value
Accel Count
(32-bit)
%AQ5
%AQ6
PWM Prescale
(32-bit)
Run Count
(32-bit)
%AQ7
%AQ8
PWM Period
(32-bit)
Decel Count
(32-bit)
%Q1 Run
%I30 Ready/Done
%I31 Error
11.6 PWM Examples
All of the PWM examples use the following formula.
Frequency =
() tPeriodCounescale ×+1Pr
000,000,16
Example 1
To get a 50% Duty Cycle @ 10 kHz waveform on PWM1:
Set %AQ1-2 = 50 (duty cycle count)
Set %AQ5-6 = 15 (prescale count)
Set %AQ7-8 = 100 (period count)
Example 2
To get a 50% Duty Cycle on PW1 and 90 % Duty Cycle on PWM2 @ 1 kHz waveform:
Set %AQ1-2 = 500 (duty cycle count)
Set %AQ3-4 = 900 (duty cycle count)
Set %AQ5-6 = 15 (prescale count)
Set %AQ7-8 = 1000 (period count)