647
Data Control Instructions Section 3-17
In this case, set the same value for the PID Control instruction’s output range
and the TPO(685) instruction’s manipulated variable range. For example,
when the PID Control instruction’s output range and the TPO(685) instruc-
tion’s manipulated variable range are both set to 12 bits (0000 to 0FFF hex),
the duty ratio is calculated by dividing the manipulated variable from the PID
Control instruction by 0FFF hex and TPO(685) converts that duty ratio to a
time-proportional output.
External Wiring Example
Connect the Transistor Output Unit to a solid state relay (SSR) as shown in
the following diagram.
Parameter Settings
COM
SSR
AC
+
−
Transistor Output Unit
Heater
12 to 24 VDC
Control data Item Contents Setting range Change with
ON input
condition
Word Bits
C 00 to 03 Manipulated
variable range
Specifies the number of input
data bits.
0 hex: 8 bits 5 hex: 13 bits
1 hex: 9 bits 6 hex: 14 bits
2 hex: 10 bits 7 hex: 15 bits
3 hex: 11 bits 8 hex: 16 bits
4 hex: 12 bits
Allowed
04 to 07 Input type Specifies whether S contains a
duty ratio or manipulated vari-
able.
0 hex: Duty ratio
Setting range for S: 0000 to
2710 hex (0.00 to 100.00%)
1 hex: Manipulated variable
Setting range for S: 0000 to
FFFF hex (0 to 65,535)
(The maximum setting
depends on the MV range
set with bits 00 to 03 of C.)
Allowed
08 to 11 Input read timing Specifies the input read timing. 0 hex: Use the beginning value of
the control period
1 hex: Use lower value
2 hex: Use higher value
3 hex: Continuous adjustment
Allowed
12 to 15 Output limit con-
trol
Specifies whether the output
limit function is enabled or dis-
abled.
0 hex: Disabled
1 hex: Enabled (See note.)
Allowed
C+1 00 to 15 Control period Control period
(Time period in which the ON/
OFF changes are made.)
0064 to 270F hex (1.00 to 99.99 s)
Note For example, 1.00 s is set as
0064 hex, and not 0001 hex.
Allowed
C +2 00 to 15 Output lower
limit
Specifies the lower limit when
the output limit is enabled.
0000 to 2710 hex (0 to 100.00%) Allowed
C +3 00 to 15 Output upper
limit
Specifies the upper limit when
the output limit is enabled.
0000 to 2710 hex (0 to 100.00%) Allowed
C+4 00 to 15 Work area This work area is used by the
system. It cannot be used by the
user.
Cannot be used. ---
C+5 00 to 15
C+6 00 to 15
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