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2ć13 – Rockwell Automation 1785-L20C_L40C, D17856.5.14 ControlNet PLC-5 Programmable Controllers User Manual User Manual

Page 41

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Chapter 2

Planning to Use Your ControlNet

PLCĆ5 Processor

2-13

To communicate between any ControlNet PLC-5 processors on the
ControlNet network, you can include explicit MSG instructions in
your ladder-logic program. See pages

4-2

and

C-1

for more information.

There can be only one PLC-5/20C or -5/40C processor updating I/O
adapters on a ControlNet network.

the PLC-5/20C or -5/40C processor updating the I/O adapters must

be at network address 01—this is the “controlling” processor

only the controlling processor is allowed to send CIO instructions

additional PLC-5/20C or -5/40C processors can do scheduled transfers

to the PLC-5/20C or -5/40C processor at node 01 by using peer-to-peer
communications through the map table, but they cannot directly
communicate with or control the ControlNet remote I/O

In addition to your controlling processor, you can attach the following
ControlNet devices to your network:

Catalog Number(s) Device(s)

Function

1785ĆL20C, ĆL40C

PLCĆ5/20C and Ć5/40C Programmable Controllers

Communicate with other PLCĆ5/20C or Ć5/40C

processors using scheduled or unscheduled peerĆtoĆ

peer communication

1784ĆKTC

ControlNet KTC Communication Card

Allows other computer platforms to communicate with

the ControlNet network; for programming only

1784ĆKTCx

ControlNet KTCx Communication Card

Allows other computer platforms to communicate with

the ControlNet network; supports redundant media; for

programming MMI

1770ĆKFC

ControlNet Serial/Parallel Communication Interface

Connects a serial or parallel device to a ControlNet

network; supports redundant media

1771ĆACN

1771 ControlNet I/O Adapter

Allows the PLCĆ5/20C or Ć5/40C processor remote

access to AllenĆBradley's family of 1771Ćdesignated I/O

modules via a ControlNet network; nonredundant only

1771ĆACNR

1771 ControlNet I/O Adapter

Allows the PLCĆ5/20C or Ć5/40C processor remote

access to AllenĆBradley's family of 1771Ćdesignated I/O

modules via a ControlNet network; supports redundant

media

1794ĆACN

1794 ControlNet Flex I/O Adapter

Allows the PLCĆ5/20C or Ć5/40C processor remote

access to AllenĆBradley's family of 1794Ćdesignated I/O

modules via a ControlNet network; nonredundant only

Using the ControlNet

PLCĆ5 Processor in a

ControlNet I/O System