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134
Built-in Inputs
Section 6-1
Conditions for Incrementing/Decrementing the Count
• The count is incremented when the direction signal is ON and decre-
mented when it is OFF.
• Only up-differentiated pulses (rising edges) can be counted.
Up/Down Mode
The up/down mode uses two signals, an increment pulse input and a decre-
ment pulse input.
Conditions for Incrementing/Decrementing the Count
• The count is incremented for each increment pulse input and decre-
mented when for each decrement pulse input.
• Only up-differentiated pulses (rising edges) can be counted.
Increment Mode
The increment mode counts single-phase pulse signal inputs. This mode only
increments the count.
Conditions for Incrementing/Decrementing the Count
Direction
signal
Pulse
signal
Count value
↑
L
No change
H
↑
Increment
↓
H
No change
L
↓
No change
L
↑
Decrement
↑
H
No change
H
↓
No change
↓
L
No change
2
2
1
1
0
0
7
6
8
7
6
5
5
4
4
3
3
Increment pulse
Decrement pulse
Decrement
pulse
Increment
pulse
Count value
↑
L
Decrement
H
↑
Increment
↓
H
No change
L
↓
No change
L
↑
Increment
↑
H
Decrement
H
↓
No change
↓
L
No change
14
2
15
1
16
0
9
10
8
7
6
11
5
12
4
13
3
Pulse
Pulse
Count value
↑
Increment
H
No change
↓
No change
L
No change
Summary of Contents for CJ1M-CPU21
Page 1: ...Cat No W395 E1 03 CJ series Built in I O CJ1M CPU21 22 23 CJ1M CPU Units...
Page 2: ...CJ series Built in I O CJ1M CPU21 22 23 CPU Units Operation Manual Revised August 2004...
Page 3: ...iv...
Page 19: ...xx...
Page 79: ...50 Wiring Examples Section 3 3...
Page 217: ...188 Origin Search and Origin Return Functions Section 6 3...
Page 220: ...191 Built in Outputs Section 7 1...
Page 247: ...218 Built in Outputs Section 7 1...
Page 251: ...222 Combinations of Pulse Control Instructions Appendix A...
Page 255: ...226 Using Pulse Instructions in other CPU Units Appendix B...
Page 263: ...234 Index...
Page 265: ...236 Revision History...