AEG 61200 M Manual de usuario descargar pdf (Pagina 7)

512/612 Modicon Micro PLCs

6

890 USE 145 00

Use a Philips #2 screwdriver to make

the field wire connections to the termi-

nal screws, then push the terminal

blocks back on the PLC base.

The J1 and J2 Screws

Two factory-set screws are installed on

the front of the unit. The J1 screw is lo-

cated below the power connectors on

the left front of the unit, and the J2

screw is located below the PLC status

display on the right front of the unit.

The position of the J1 screw in the PLC

housing determines whether there is

conventional signal ground-to-chassis

grounding or grounding at different po-

tentials for non-grounded applications.

When J1 is fully tightened—i.e., in its

factory-set position—both signal ground

and chassis ground in the PLC are tied

together and to the input power terminal

block ground screw. This is the pre-

ferred method of grounding for all

single, parent, or child PLCs whenever

solid earth ground is available.

When the J1 is loosened (counterclock-

wise), it disconnects earth ground from

signal ground. The PLC can now be

connected as part of a non-grounded or

single-point ground system. In a single-

point ground system, only one PLC

needs to be tied to chassis ground (J1

screw tightened); all other PLCs in the

system can be referenced to this single

point over the I/O expansion link (their

J1 screws loosened). The expansion

link must always be attached to prevent

communication errors in the un-

grounded PLCs.

Caution Before you power

up your system, make sure

that all the PLCs are at the

same earth ground potential

to reduce communication er-

rors, ground loop lockups,

and damage to the PLCs or

other attached devices.

The J2 screw provides 120 W termina-

tion for the PLC when it is tightened—

J2 is shipped from the factory in a tight-

ened position. When the PLC is

operating in single mode or when it is a

parent or child at the head or tail end of

an I/O expansion link, the J2 screw

must remain tightened. When the PLC

resides in a non-terminating location on

an I/O expansion link, the J2 screw

must be loosened by one turn.

Wiring External Power

External connections to the power sup-

ply are made at the five terminal screws

located on the left front of the PLC.

The wires from the external source are

fed to the appropriate screws through

slots along the left side of the PLC, as

shown in the following illustration.

1

2

3

1. Five terminal screws for external power wiring

2. Side slots for leading wires from the power source

to the terminal screws

3. Label indicating power wiring scheme

A Left Front Isoview of the PLC

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