Omron CPM1 Programming Manual page 136

The directions of pulse inputs are all ignored. The frequency of a pulse that has
been input is read, without regard to the direction.
The following table shows the relationships between synchronized pulse control
and the CPM2A's other functions.
Note When inputs 00000 and 00001 are set for use as synchronized pulse control in-
puts, the input time constant settings for the affected inputs are disabled. The
input time constants remain in effect, however, for the values for refreshing the
relevant input data area.
The relationship between the pulse input frequency and the pulse output fre-
quency is shown below.
Pulse input frequency X
10 to 500 Hz
20 Hz to 1 kHz
300 Hz to 20 kHz
The scaling factor control cycle is 10 ms, and the pulse output frequency is
changed at intervals of 10 ms with respect to the pulse input frequency.
Frequency
Function
Synchronized pulse control
Interrupt inputs
Interval timer interrupts
High-speed counters
Interrupt inputs (counter mode)
Pulse outputs
Quick-response inputs
Input time constant
Clock
= Rough pulse output frequency
Frequency ratio
Pulse output frequency
Synchronized pulse control
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Can be used simultaneously.
Can be used simultaneously.
Cannot be used simultaneously.
Can be used simultaneously.
Cannot be used simultaneously.
Can be used simultaneously.
See note.
Can be used simultaneously.
Values are rounded off in units of 10 Hz.
A value less than 10 Hz is regarded as 0 Hz.
A value greater than 10 kHz is regarded as 10 kHz.
(10 Hz to 10 kHz)
Section 2-7
Time