A-B 1783-SFP1GSX 1000BASE-SX multimode fiber

Serial Network 

The SLC 5/03, SLC 5/04, and SLC 5/05 processors have a serial port which is

configurable for RS-232 compatible serial communication. Use the serial port to connect

to devices that:

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

programming workstations, or other Encompass partner devices.

• communicate using DH-485 protocol.

• send and receive ASCII characters, such as ASCII terminals, bar code readers, and printers.

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

mode to communicate with other devices on the serial link. You can select the following

DF1 modes:

• DF1 full-duplex: provides communication between an SLC 500 controller and other

• DF1 compatible devices. In point-to-point mode, the SLC 500 controller uses

DF1 full-duplex protocol.

• DF1 half-duplex master: polls and transmits messages between the master and

each remote node. In master mode, the SLC 500 controller uses DF1 half-duplex polled protocol.

• DF1 half-duplex slave: uses the controller as a slave station in a master/slave serial network. 

In slave mode, the SLC 500 controller uses DF1 half-duplex protocol.

DF1 radio modem: a hybrid between DF1 full-duplex and DF1 half-duplex, 

this protocol is optimized for use with radio modem networks.

Direct Communication Module

The 1747-DCM module links the SLC 500 controller to the Allen-Bradley PLC for

distributed processing. The DCM acts as a remote I/O adapter on a remote I/O link.

Information is transferred between a local PLC or SLC scanner and a remote

1747-DCM module during each remote I/O scan. The number of DCMs that a scanner

can supervise depends on the number of chassis the scanner supports and the chassis size

of the DCM. The SLC 500 module controllers support multiple DCMs.

Note: An important distinction between a DCM module and the 1747-ASB module is

that a DCM is placed in the chassis with the processor and it does not scan any I/O in the

chassis as an ASB module does.

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