Cj1M Cpu Unit Features - Omron CJ - 08-2008 Operation Manual

CJ1-H and CJ1M CPU Unit Features
Power Supply Units with Replacement Notification
1-3-3

CJ1M CPU Unit Features

Built-in I/O
General-purpose I/O
Interrupt Inputs
High-speed Counters
Pulse Outputs
22
The CJ1W-PA205C Power Supply Units with Replacement Notification pro-
vide six display levels using a 7-segment display on the front panel of the Unit
to indicate the remaining service life of the Power Supply Unit. An alarm out-
put also notifies when the estimated remaining service life drops to 6 months
or shorter. This function enables Power Supply Unit replacement before the
power supply reaches the end of its service life resulting in a system failure. It
also enables planning Power Supply Unit replacement. For details refer to
Power Supply Units with Replacement Notification on page 12 .
The CJ1M CPU Units are high-speed, advanced, micro-sized PLCs equipped
with built-in I/O. The built-in I/O have the following features.
Immediate Refreshing
The CPU Unit's built-in inputs and outputs can be used as general-purpose
inputs and outputs. In particular, immediate I/O refreshing can be performed
on the I/O in the middle of a PLC cycle when a relevant instruction is exe-
cuted.
Stabilizing Input Filter Function
The input time constant for the CPU Unit's 10 built-in inputs can be set to 0 ms
(no filter), 0.5 ms, 1 ms, 2 ms, 4 ms, 8 ms, 16 ms, or 32 ms. Chattering and
the effects of external noise can be reduced by increasing the input time con-
stant.
High-speed Interrupt Input Processing
The CPU Unit's 4 built-in inputs can be used for high-speed processing as
regular interrupt inputs in direct mode or interrupt inputs in counter mode. An
interrupt task can be started at the interrupt input's rising or falling edge (up or
down differentiation.) In counter mode, the interrupt task can be started when
the input count reaches the set value (up-differentiated or down-differentiated
transitions.)
High-speed Counter Function
A rotary encoder can be connected to a built-in input to accept high-speed
counter inputs.
Trigger Interrupts at a Target Value or in a Specified Range
Interrupts can be triggered when the high-speed counter's PV matches a tar-
get value or is within a specified range.
Measure the Frequency of High-speed Counter Inputs
The PRV(881) instruction can be used to measure the input pulse frequency
(one input only.)
Maintain or Refresh (Selectable) High-speed Counter PVs
The High-speed Counter Gate Bit can be turned ON/OFF from the ladder pro-
gram to select whether the high-speed counter PVs will be maintained or
refreshed.
Fixed duty ratio pulses can be output from the CPU Unit's built-in outputs to
perform positioning or speed control with a servo driver that accepts pulse
inputs.
Section 1-3