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Precautions when Switching from Previous Units
• Previous models of Expansion I/O Units cannot be connected to V2 CPU Units.
• ZEN-8E1@R Expansion I/O Units with relay outputs need to be connected to a power supply.
• A ZEN-@C@D@-D-V2 CPU Unit with DC power supply cannot be connected to an Expansion I/O Unit with AC inputs.
• When connecting Expansion I/O Units with DC inputs to a CPU Unit with an AC power supply, the burst noise immunity will be 1 kV (IEC 61000-
4-4).
• There is no change to the 8 A per contact for relay output, but the total output for all contacts must be as follows:
Units with 10 I/O Points: 20 A max. (15 A max. for Communications-type CPU Units)
Units with 20 I/O Points: 40 A max.
Expansion I/O Units:
20 A max.
• Always use the ZEN-SOFT01-V4 Support Software for V2 CPU Units.
• Input wiring for CPU Units with DC power supplies differs from that for Pre-V1 CPU Units. Refer to the following diagrams.
V2 and V1 CPU Units
COM wiring depends on whether a negative common or positive common is being used.
Negative (−) COM Wiring
24 VDC
COM wiring required.
Analog inputs possible.
−
+
COM
CPU Unit with 10 I/O Points
■ Changes
Ratings and Specifications
CPU Units
Item
Rated power
Models with DC
supply voltage
power supply
Power
Models with AC
consumption
power supply
Models with DC
power supply
Inrush current Models with AC
power supply
Models with DC
power supply
DC inputs
Input impedance
I0 to I3
ON voltage
(See note 1.)
Input common
Positive (+) COM Wiring
24 VDC
Input
devices
+ −
COM
CPU Unit with 10 I/O Points
Note: I4 and I5 (Ia and Ib for CPU Units with 20 I/O
points) cannot be used as analog input terminals.
V2 Units
10.8 to 28.8 VDC
See Ratings on page 7.
Models with 10 I/O points: 4.5 A max.
Models with 20 I/O points: 4.5 A max.
Models with 10 I/O points: 30 A max.
Models with 20 I/O points: 30 A max.
5.3 k Ω
8 VDC min.
Independent common terminal
The input circuit common terminal is connected
internally to the negative ( − ) side of the power
supply circuit.
COM wiring required.
Input
devices
20.4 to 26.4 VDC
30 VA max.
(with 3 Expansion I/O Units connected)
6.5 W max.
(with 3 Expansion I/O Units connected)
40 A max.
20 A max.
5 k Ω
16 VDC min.
Programmable Relay
Pre-V1 CPU Units
24 VDC
Analog inputs possible.
+ −
NC
CPU Unit with 10 I/O Points
V1 Units
Pre-V1 Units
4.8 k Ω
Internally connected to
power supply terminal
ZEN V2 Units
Input
devices
29
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