Rockwell Automation 1785 PLC-5 User Manual download pdf (Page 28)

Publication 1785-SG001B-EN-P - June 2006

26 Select Network Communications

Serial Network

The PLC-5 serial port is configurable for RS-232, RS-423, or RS-422A

compatible serial communication. Use the serial port to connect devices that:

• communicate using the DF1 protocol, such as modems, communication

modules, programming workstations, or other serial devices.

• send and receive ASCII characters, such as ASCII terminals, bar-code

readers, and printers.

When configured for System mode, the serial port supports the DF1 protocol.

Use System mode to communicate with others devices on the serial link.

The serial port, in System mode, also supports supervisory control and data

acquisition (SCADA) applications. SCADA systems let you monitor and

control remote functions and processes using serial communication links

between master and slave locations.

Use This DF1 Mode For

Point-to-point • Communication between a PLC-5 controller and other

DF1-compatible devices.

• In Point-to-Point mode, the PLC-5 controller uses DF1

full-duplex protocol.

DF1 Master • Control of polling and message transmission between the

master and each remote node.

• In Master mode, the PLC-5 controller uses DF1 half-duplex

polled protocol.

DF1 Slave • Using the controller as a slave station in a master/slave serial

network.

• In Slave mode, the PLC-5 controller uses DF1 half-duplex

protocol.

Cat. No. Function Comm.

Rate

Connections Design Considerations Cable Power

Dissipation,

Max

Backplane

Current

Load

1771-DA Interfaces a PLC-5

controller and a

peripheral device that

generates ASCII

characters

Configurable,

depending

on serial

protocol

RS-232-C

Current loop, 20 mA

Place in the local I/O

chassis

Custom 26-pin

cable

(1)

6.8 W 1.3 A

(1)

See the Enhanced and Ethernet PLC-5 Programmable Controllers User Manual, publication 1785-UM012.

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Rockwell Automation 1785 PLC-5 User Manual Page 28

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