欧姆龙PLC操作手册_c20p_c28p_c40p_c60p(7)

Wiring CPUs and Expansion I/O UnitsSection 2-5

Connect an I/O Link Unit as shown in the following diagram, using M4 termi-nal screws.

M4 screws

100 to 240 VAC

Breaker

Insulatingtransformer1:1

The following diagram illustrates the proper wiring for CPUs and ExpansionI/O Units with the suffix “-D.” These models use a power supply of 24 VDCwith an operating voltage range of 20.6 to 26.4 VDC. Be careful to connectthe positive and negative terminals correctly. When power is turned ON, theincoming current will be approximately 30 A.

Breaker

M3.5 screws

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Wiring CPUs and Expansion I/O Units

Ground

Section 2-5

The Line Ground (LG) terminal is a noise filter neutral terminal which doesnot normally require grounding. When electrical noise is a problem, however,this terminal should be connected to the GR terminal.

Attach an independent ground-wire with a cross-sectional area of at least 2mm2 (AWG 14) to the GR terminal, to avoid electrical shock. Ground resis-tance must be less than 100 W. Do not use a ground-wire longer than 20 m.Care must be taken because ground resistance is affected by the nature ofthe ground, water content, season, and the amount of time that has elapsedsince the wire was laid underground.

CPU operation may be adversely affected if the ground-wire is shared withother equipment, or if grounding is attempted by attaching the ground-wire tothe metal superstructure of a building. When either Expansion I/O Units orI/O Link Units are used, they also require grounding at the GR terminal.These may all be included on the same ground.

GR

LG

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I/O WiringSection 2-6

2-6I/O Wiring

This section shows I/O wiring diagrams for representative models of all theCPUs, Expansion I/O Units, and I/O Link Units covered in this manual. It alsogives connection examples for the sensors and switches which can be con-nected as input devices.

2-6-1Unit Wiring Diagrams

The following items are all available for use as outputs. Do not mix themwithin the same common circuit.

OutputRelayTransistorTriac

Load Power SupplyUp to 250 VAC/24 VDC5 to 24 VDC

100 to 120/200 to 240 VAC

When using transistor outputs, connect the common line (COM) to the loadpower supply negative side. For an induction load, connect the diode to theload in parallel, as shown in the diagram, such that the cathode is on thepositive side of the power supply.

L+OUTCOM

When using the high-speed counter (HDM(98)) instruction, wire input 0000as the high-speed counter input and input 0001 as the hardware reset input.If the HDM(98) is not used, inputs 0000 and 0001 may be used as generalinput terminals. Their response time (0.15 ms), however, will be shorter thanthe other inputs.

Do not connect the NC terminals to anything. The DC inputs in the followingI/O wiring diagrams are NPN (positive common). Reverse the polarity if PNP(negative common) is used.

In the diagrams, representative models are sometimes used to cover severalmodels with similar wiring. In such cases, the type of Unit (i.e., CPU C60P) islisted first, followed by the suffix of the applicable model number. A space leftblank (j) in the model number indicates that any of several numbers couldbe inserted there.

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I/O Wiring

CPU C20P, C28P, C40P(CDj-A)

Section 2-6

The inputs can use the Unit’s 24-VDC power supply output. If the maximumoutput current of 0.3 A is not sufficient a separate DC power supply must beused.

Not in C20P

LoadLoadLoadLoadpowerpowerpowerpower

Groundsupplysupplysupplysupply

Loadpowersupply

Loadpowersupply

Not in C20P or C28P

Loadpowersupply

Relay contact outputsTransistor outputsTriac outputs

Powersupply(100 to240 VAC)

NCNC

M3.5 screws

7.5 max.7.5 max.Inputs (24 VDC)

High-speedcounterinput

24-VDC output

(0.3 A max.)

Hardware reset input

Not in C20P

Not in C20P or C28P

COM

NC: Do not connect the NC terminals to anything.

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I/O Wiring

CPU C20P, C28P, C40P(CAj-A)

Section 2-6

Inputs 0000 and 0001 can use the Unit’s 24-VDC power supply output. If themaximum output current of 0.3 A is not sufficient a separate DC power sup-ply must be used. Inputs 0002 to 0107 take a 100-VAC power supply.

Not in C20P

LoadLoadLoadLoadpowerpowerpowerpower

Groundsupplysupplysupplysupply

Loadpowersupply

Loadpowersupply

Not in C20P or C28P

Loadpowersupply

Relay contact outputsTriac outputs

Powersupply(100 to240 VAC)

NCNC

M3.5 screws

7.5 max.7.5 max.0000, 0001 24-VDC inputs0002 to 0101 100-VAC inputsHigh-speedcounterinput

Hardwarereset input

Not in C20P

24-VDC output

(0.3 A max.)

Not in C20P or C28P

100 to 120 VAC

NC: Do not connect the NC terminals to anything.

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