User manual

890 USE 145 00

512/612 Modicon Micro PLCs

The racks may also be stacked on two

DIN rails and connected by a BXT 201

bus extension cable. There may be ei-

ther one or two racks mounted on each

DIN rail.

Only DTA 201 backplanes can be used

for A120 I/O in a stacked layout—DTA

202 (two-slot) backplanes are not

allowed.

Caution The connectors on

the BXT 201 cable are polar-

ized and must be connected

properly—the A connector

must be attached to the right-

most unit on the top DIN rail

and the B connector must be

attached to the rightmost unit

on the bottom DIN rail.

DTA 201

BXT 201

DTA 201

BXT 201

DTA 201

BXT 201

DTA 201

BXT 201

Rack 1

Rack 2 Rack 3

Rack 2

Rack 4Rack 3

Rack 1

Rack 3

Rack 2

Rack 4

Rack 1

Stacked A120 I/O Expansion Layouts

PLC PLC

PLC

Note The rack numbers in a stacked layout are determined by the way the

rack on the right side of the lower level is connected via BXT 201 cable to the

PLC or to rack 1 above.