Omron Sysmac CJ Series, Operation Manual

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Data Exchange with the CPU Unit Section 2-5
• 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.
2-5 Data Exchange with the CPU Unit
2-5-1 Overview
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.
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.
Operation Data 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.
Initialization 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.
Operating Parameters 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.
20 words
100
words
10
words
90
words
n = 2000 + unit No. x 10
n + 19 =
2000 + unit No. x 10 + 19
m = unit No. x 100
m + 9 =
unit No. x 100 +9
m + 10 =
unit No. x 100 + 10
m + 99 =
unit No. x 100 + 99
CIO Area
Loop 1 PV
Loop 2 PV
DM Area
Alarm Mode
Etc.
Alarm 1 SV
Etc.
I/O refresh
Power ON and
restart
I/O refresh
Temperature Control Unit
Operation Data
Continuously
exchanges basic
data with CPU Unit
Exchanges the alarm
mode, alarm hysteresis,
etc.
Continuously
exchanges operating
parameters.
CJ-series CPU Unit
Etc.
Initialization Data
Operating Parameters