Omron CJ1M-CPU22 User Manual

135
Built-in Inputs Section 6-1
• Only up-differentiated pulses (rising edges) can be counted.
Note With CJ1M CPU Unit Ver. 2.0, the count of the high-speed counter can be
monitored to see if it is currently being incremented or decremented. The
count in the current cycle is compared with the count in the previous cycle to
determine if it is being incremented or decremented. The results is shown in
the High-speed Counter 0 Count Direction Flag (A27410) and the High-speed
Counter 1 Count Direction Flag (A27510). (0: Decrementing, 1: Incrementing)
Counting Modes
Linear Mode Input pulses can be counted in the range between the lower limit and upper
limit values. If the pulse count goes beyond the lower/upper limit, an under-
flow/overflow will occur and counting will stop.
Lower and Upper Limits of the Range
The following diagrams show the lower limit and upper limit values for incre-
ment mode and up/down mode.
Ring Mode Input pulses are counted in a loop within the set range. The loop operates as
follows:
• If the count is incremented from the max. ring count, the count will be
reset to 0 automatically and incrementing will continue.
• If the count is decremented from 0, the count will be set to the max. ring
count automatically and decrementing will continue.
Consequently, underflows and overflows cannot occur when ring mode is
used.
Max. Ring Count
Use the PLC Setup to set the max. ring count, which is the max. value of the
input pulse counting range. The max. ring count can be set to any value
between 00000001 and FFFFFFFF hex.
4294967295
(FFFFFFFF Hex)
−2147483648
(80000000 Hex)
0
(00000000 Hex)
+2147483647
(7FFFFFFF Hex)
PV overflow
Increment Mode
Up/Down Mode
PV underflow
PV overflow
0
(000000 Hex)
2
32
−1
0
Count value
Max. ring
count

Omron CJ1M-CPU22 Specifications

General

Brand	Omron
Model	CJ1M-CPU22
Category	Controller
Language	English