7-6
Section
Pulse Outputs
104
7-6-4 Precaution in Using Pulse Outputs
Pulses are output from the CS1W-HCP22 according to the clock frequency spe-
cified 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 inte-
ger dividing ratio to create and output the output pulse frequency. This means
that the actual frequency may not be the same as the target 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.
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)
Formula:
Actual frequency = Clock frequency
B
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 frequen-
cy 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
Summary of Contents for CS1 -
Page 1: ...Cat No W378 E1 1 Customizable Counter Units SYSMAC CS1 CS1W HI001 HCP22 HCA22 OPERATION MANUAL...
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Page 3: ...CS1W HIO01 HCP22 HCA22 Customizable Counter Units Operation Manual Produced January 2001...
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