Data Exchange With The Cpu Unit; Overview - Omron CJ Series Operation Manual

Data Exchange with the CPU Unit

2-5

Data Exchange with the CPU Unit

2-5-1

Overview

CJ-series CPU Unit
20 words
n + 19 =
2000 + unit No. x 10 + 19
m = D20000 + unit No. x 100
10
m + 9 =
words
D20000 + unit No. x 100 +9
100
m + 10 =
words
D20000 + unit No. x 100 + 10
90
words
m + 99 =
D20000 + unit No. x 100 + 99
Operation Data
Initialization Data
Operating Parameters
• Noise from the power supply line may be superimposed on I/O signals
if equipment that generates high frequency noise is used nearby or the
Temperature Control Unit's power line is shared with electrical welding
equipment or discharging equipment. In this case, install a noise filter
at the power supply inputs.
The Temperature Control Unit exchanges the following data with the CPU
Unit.
• Operation Data
• Initialization Data
• Operating Parameters
Data exchange between the CPU Unit and the Temperature Control Unit is
performed through the words allocated to the Temperature Control Unit as a
Special I/O Unit in the CIO and DM Areas of the CPU Unit. The Operation
Data is in the Special I/O Unit Area in the CIO Area and the Initialization Data
and Operating Parameters are in the Special I/O Unit Area in the DM Area.
CIO Area
Loop 1 PV
n = 2000 + unit No. x 10
Loop 2 PV
Etc.
DM Area
Alarm Mode
Etc.
Alarm 1 SV
Etc.
As shown in the above diagram, Special I/O Unit Areas are allocated for the
three types of data in the CIO and DM Areas according to the unit number set
for the Temperature Control Unit as a Special I/O Unit.
The basic data used to operate the Temperature Control Unit is exchanged
with the CPU Unit as Operation Data during the CPU Unit's I/O refresh period.
Operation Data includes the Process Values, Set Points, Stop Bits, Start AT
Bits, Stop AT Bits, and other data.
The data used to initialize the Temperature Control Unit is exchanged with the
CPU Unit as Initialization Data when the PC is turned ON or the Temperature
Control Unit is restarted. Initialization Data includes the Alarm Modes, Alarm
Hysteresis, and other data.
The parameters that control Temperature Control Unit operation are
exchanged with the CPU Unit as Operating Parameters during the CPU Unit's
I/O refresh period. Operating Parameters include the Alarm SVs, Control
Cycles, Proportional Bands, Integral Times, and other parameters.
Temperature Control Unit
Operation Data
Continuously
exchanges basic
I/O refresh
data with CPU Unit
Initialization Data
Exchanges the alarm
mode, alarm hysteresis,
Power ON and
etc.
restart
Operating Parameters
Continuously
exchanges operating
parameters.
I/O refresh
Section 2-5
29