Omron CP1H-X40D Operation Manual page 444

Analog Output Units
Internal Circuits
Note
Allocating Output Words
410
2. Wiring Analog Outputs
The following diagram shows the internal circuit using CP1W-DA041/DA042
as an example, which wires analog outputs 1 to 4. In the case of CP1W-
DA021, analog outputs 1 to 2 can be used.
Analog ground
■ Wiring for Analog Outputs
2-core shielded
twisted-pair cable
V OUT
Analog
I OUT
output
COM
unit
(1) Connect the shield to the FG terminal to prevent noise.
(2) Separate wiring from power lines (AC power supply lines, high-voltage
lines, etc.)
(3) When there is noise in the power supply line, install a noise filter on the
input section and the power supply.
(4) When external power is supplied (when range codes are set), or when the
power is interrupted, there may be a pulse status analog output of up to
1 ms. If this status is a problem, take the following measures.
• Turn ON the power to the CP1H CPU Unit, check the operation status,
and then turn ON the power at the load.
• Turn OFF the power to the load and then turn OFF the power to the
CP1H CPU Unit.
3. Creating the Ladder Program
Four output words (n+1 to n+4) are allocated, beginning from the first word fol-
lowing the last I/O word allocated to the CPU Unit or already-connected
Expansion I/O Unit or Expansion Unit. For CP1W-DA021, two output words
(n+1, n+2) are allocated.
CP1W-DA041/
CP1W-DA042
Analog Output Unit
Words n+1 to n+4
V OUT1
Analog output 1
I OUT1
COM1 (−)
to to
V OUT4
Analog output 4
I OUT4
COM4 (−)
NC
+
Analog
Analog
device
with
output
voltage
−
unit
input
FG
Section 7-3
2-core shielded
twisted-pair cable
+
V OUT
Analog
device
I OUT
with
−
current
COM
input
FG