Omron CQM1H - PROGRAM Programming Manual page 421

Special Instructions
Pulse Frequency (F)
396
2. The INI(61) instruction is executed with C=003.
3. SPED(64) is executed again with the output frequency, F, set to 000.
When outputting pulses in independent mode, specify the number of pulses
beforehand by executing PULS(65). When outputting from port 1 or 2, specify
the direction (CW or CCW) as well.
In independent mode, the number of pulses that have been output to ports 1
and 2 are contained in IR 236 and 237 (port 1) and IR 238 and IR 239 (port 2).
Port 1 pulse output PV:
Port 2 pulse output PV:
Although the number of pulses can be monitored in independent mode, the
number of pulses cannot be monitored while pulses are being output in con-
tinuous mode.
In continuous mode, pulses will be output until the INI(61) instruction is exe-
cuted with C=003 or SPED(64) is executed again with F=0000. If the direction
(CW or CCW) is not specified when outputting from port 1 or 2, the pulses will
be CW.
The value of F sets the pulse frequency, as shown below. Setting F to 0000
will stop the pulse output at the specified location.
Output Units
Output bits 10 Hz 0000 (Stops output.) or 0002 to 0100 (20 Hz to 1 kHz)
Port 1 or 2 10 Hz 0000 (Stops output.) or 0001 to 5000 (10 Hz to 50 kHz)
1 Hz 0000 (Stops output.) or 0010 to 9999 (10 Hz to 9,999 Hz)
Precautions Regarding Pulse Output
The pulse frequency output from the CQM1H-PLB21 Pulse I/O Board is gen-
erated by dividing the 500-kHz basic clock pulse by an integer value, which
results in a difference between the set frequency and actual frequency. Refer
to the following equation for calculating an actual frequency.
Set Frequency: Output frequency set in the instruction by the user
Dividing Unit: An integer set in the dividing circuit to generate an output
pulse of the set frequency
Actual Frequency: Output pulse frequency actually output from the dividing
circuit
The dividing unit is set based on
the frequency set by the user.
500 kHz
Pulse-
Dividing circuit
generating
clock
Equation:
Actual frequency (KHz) = 500 (KHz)/INT (500 (kHz)/Set frequency (kHz))
INT: Function for obtaining an integer value
INT (500/Set frequency): Dividing unit
The difference between the set frequency and actual frequency becomes
larger as the frequency becomes higher.
Leftmost 4 digits Rightmost 4 digits
IR 237 IR 236
IR 239 IR 238
Possible values of F
Output pulse
(actual frequency)
Section 5-28