Omron CS1W-HCA12-V1, Operation Manual

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Pulse Outputs
Section 7-6
7-6-4 Precaution in Using Pulse Outputs
Pulses are output from the CS1W-HCP22-V1 according to the clock fre-
quency specified in the Unit Setup Area (bits 08 to 15 of DM 6613 and DM
6614: 25 MHz, 6.25 MHz, 1.5625 MHz, or 390.625 kHz). The clock signal is
divided by an integer dividing ratio to create and output the output pulse fre-
quency. This means that the actual frequency may not be the same as the tar-
get frequency. Refer to the following information to calculate the actual
frequency.
The following information is used to calculate the output frequency.
Target frequency:
Set by user.
Dividing ratio:
An integer set in the dividing circuit used to generate the output pulses at the
target frequency.
Actual frequency:
The actual frequency that is output as generated by the dividing circuit.
Formula:
Actual frequency = Clock frequency
¸
INT (clock frequency/target frequency)
Note INT (clock frequency/target frequency) is the dividing ratio.
The difference between the target frequency and the actual frequency
increases at higher frequencies. The following tables shows examples for a
clock frequency of 25 MHz.
Target frequency (Hz) Actual output frequency
198,413 to 200,000 200,000
196,851 to 198,412 198,412
195,313 to 196,850 196,850
| |
151,516 to 152,439 152,439
150,603 to 151,515 151,515
149,701 to 150,602 150,602
| |
100,402 to 100,806 100,806
100,001 to 100,401 100,401
99,602 to 100,000 100,000
| |
50,101 to 50,200 50,200
50,001 to 50,100 50,100
49,901 to 50,000 50,000
| |
402 402
401 401
400 400
Dividing circuit
Actual output frequency
Integer dividing ratio set
according to the target
frequency set by user.
Clock-generated pulses
(one of four settings
possible)