Omron CJ - INSTRUCTIONS User Manual

3. Instructions
670
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Precautions
When using TPO(685) in combination with PID(190) in a cyclic task and also using an interrupt task,
temporarily disable interrupts by executing DI(693) (DISABLE INTERRUPTS) ahead PID(190) and
TPO(685). If interrupts are not disabled and an interrupt occurs between the PID(190) and TPO(685),
the control period may be shifted.
Example Programming
z Combining TPO(685) with PID(190)
When CIO 0.00 is ON, TPO(685) takes the manipulated variable output from PID(190) (contained in
D0), calculates the duty ratio from that manipulated variable value (Duty ratio = MV ÷ MV range),
converts the duty ratio to a time-proportional output, and outputs the pulses to CIO 2001.
In this case, CIO 20 is allocated to a Transistor Output Unit and bit CIO 2001 is connected to a solid
state relay for heater control.
DI
EI
S
C
D
S
C
R
Reception prohibited
Reception allowed
Interrupt task
Interrupt task
Cyclic task
PID
PV input
PID parameters
TPO
Parameters
Pulse output
Manipulated
variable
Manipulated
variable
0.00
PID
10
D200
D0
TPO
D0
D5000
20.01
S
C
D
D200
D201
:
D206
:
:
D5000
S
C
R
4
41
PV input
PID parameters
Manipulated variable
Manipulated variable
Parameters
Pulse output
Set value (SV)
Proportional band (P)
When CIO 0.00 goes from OFF to ON, PID(190)
reads the parameters, performs the PID calculation
with the PV input in CIO 10, and outputs the
manipulated variable (MV) to D0.
TPO(685) calculates the duty ratio by dividing the
MV in D0 by the MV range (0FFF Hex since the
range is set to 12 bits), converts that duty ratio to a
time-proportional output, and outputs the pulse
output to bit 01 of CIO 20.
Output range: 4 hex
(12 bits: 0000 to 0FFF hex)
MV range: 4 hex
(12 bits: 0000 to 0FFF hex)
Input type: 1 hex (MV)

Omron CJ - INSTRUCTIONS Specifications

General

Brand	Omron
Model	CJ - INSTRUCTIONS
Category	Controller
Language	English