Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Instrukcja Użytkownika Pobierz pdf (Strona 318)

Addressing

Appendix A

A11

Figure A.8

Example

of 1slot Addressing

Rack 1 Rack 2

I/O Group No.

01 23 45 67 01 23 45 67

I/O Group 1

Address

1 1 1

I/O Group 1

Address

121

Input

Rack

I/O Group

NOTE: When addressing a block transfer module, it must be addressed

by the lowest group number that it occupies and at slot 0. For example,

a two-slot block transfer module in rack 1, groups 2 and 3 would be

addressed (by Rack-Group-Slot) at location 120.

Also, see the appropriate block transfer module user’s manual. Block

Transfer modules must be located in the same slot pair (i.e., slots 0/1, 2/3,

4/5, etc.) or they will not work. (Some two-slot B.T. modules use the lower

slave bus on the I/O chassis backplane for intramodule communications.)

When you select 1/2-slot addressing, the processor (by way of the adapter)

addresses one-half of an I/O module slot as one I/O group. The physical

address of each I/O slot corresponds to two input and two output image

table words. the type of module you install (8, 16 or 32 I/O pts.)

determines the number of bits in these words that are used.

With 1/2-slot addressing, since 32 input bits are 32 output bits are set aside

in the processor’s image table for each slot (16 input image table bits and

16 output image table bits times 2 groups per slot = 32 of each), you may

use any mix of I/O modules (8-, 16- or 32-point) in the I/O chassis.

A.2.3

1/2Slot Addressing

1 2 ... 313 314 315 316 317 318 319 320 321 322 323 ... 345 346

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Rockwell-automation 1772-LP3 PLC - 2/30 Programmable Controller Progra Instrukcja Użytkownika Strona 318