Communications Procedure - Omron CQM1 Operation Manual

Application
2-6-1

Communications Procedure

Power ON
Output
word
Input
FFFF
word
Initialization
1,2,3...
C
Item To Be Set
Value
0 Set point
1 Proportional band (for advanced PID)
2 Integral time (for advanced PID)
3 Derivative time (for advanced PID)
4 Hysteresis (for ON/OFF control)
5 Control cycle (for advanced PID or manual control) 5
6 Input shift value
7 No item set (See note 2.)
8 Manual manipulated variable
9 Do not set.
A Heater burnout alarm setting (only for models with
heater burnout alarms)
B Do not set.
The following diagram illustrates the procedures used to set parameters, mon-
itor data, and read data.
Note No commands are set at startup.
60 ms max.
(1) (2)
(((
C
0000
Initialization
completed
1. Output word: An I/O allocation command (C@@@) is set to specify the loop
and the items to be set and monitored.
2. Input word: The I/O allocation command set in the output word will be set
by the system as a "Command Acknowledged Flag" to indicate that the
command has been acknowledged.
3. Output word: The write data for the I/O allocation command set in 1. is set.
4. Input word: After the data specified in 3. has been set, the data specified
to be monitored in 1. will be set by the system. This also functions as a
"Write Completed Flag" to indicate that the write operation has been com-
pleted.
Output word
Item to be set
60 ms max.
(3) (4)
Write data
(((
C
Read data
Item To Be Monitored
Value
0 Set point
1 Proportional band (for advanced PID)
2 Integral time (for advanced PID)
3 Derivative time (for advanced PID)
4 Hysteresis (for ON/OFF control)
Control cycle (for advanced PID or manual control)
6 Input shift value
7 Process value
8 Manipulated variable
9 Status
A Heater burnout alarm setting (only for models with
heater burnout alarms)
B Heater current (only for models with heater burnout
alarms)
Section 2-6
Loop number: 1 to 4
Item to be monitored
255