Overview Of The Functions Of Cj2M Pulse I/O - Omron SYSMAC CJ Series User Manual

1 Overview
1-2 Overview of the Functions of CJ2M
Pulse I/O
The following functions of the pulse I/O of the CJ2M can be used by installing a Pulse I/O Module.
Select which function to use for each input and output in the PLC Setup.
Functions of Normal I/O
The inputs and outputs on the Pulse I/O Module can be used as normal inputs and normal outputs.
(Each Pulse I/O Module provides up to 10 inputs and 6 outputs.) The input time constant can be set to
0 ms (no filter), 0.5 ms, 1 ms, 2 ms, 4 ms, 8 ms, 16 ms, or 32 ms. The same setting is used for all 20
inputs. Chattering and the effects of external noise can be reduced by increasing the input time con-
stant.
Quick-response Inputs
By setting an input on the Pulse I/O Module to quick-response input operation, inputs with signal widths
as small as 30 µs can be read with certainty regardless of the cycle time. Up to four quick-response
inputs can be used for each Pulse I/O Module (eight for the entire CJ2M PLC).
Interrupt Inputs
An interrupt task can be started when an input on the Pulse I/O Module turns ON or OFF (Direct Mode).
Alternatively, the rising or falling edge of the inputs can be counted. When the count reaches a specified
value, an interrupt task can be started. This is called Counter Mode. Up to four interrupt inputs can be
used for each Pulse I/O Module (eight for the entire CJ2M PLC).
High-speed Counters
A rotary encoder can be connected to the Pulse I/O Module input to accept differential phase or single-
phase high-speed pulse counter inputs.
High-speed counter inputs (differential phase: 50 kHz, single-phase: 100 kHz) for up to 2 axes can be
used for each Pulse I/O Module (up to 4 axes for the entire CJ2M PLC).
Use the Linear Mode or Ring Mode for the Counting Mode
The maximum value of the ring counter can be changed during operation using the MODE CON-
TROL (INI(880)) instruction.
Start Interrupt Tasks Using Target Value Comparison or Range Comparison
for High-speed Processing
Interrupt tasks can be started when the PV reaches a target value for target value comparison, or
when it enters a specified range for range comparison.
Frequency Measurement
The input pulse frequency can be measured by executing the HIGH-SPEED COUNTER PV READ
(PRV(881)) instruction. (Applicable only to high-speed counter 0.) It is possible to convert the fre-
quency to a rotational speed by executing the COUNTER FREQUENCY CONVERT (PRV2(883))
instruction.
1-4 CJ2M CPU Unit Pulse I/O Module User's Manual