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Connecting multiple plc/controllers serially using, Daisy chaining, Hmi5000p/l/hd – Watlow EZwarePlus Programming User Manual

Page 34: Rs-485, Plc plc plc

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EZwarePlus Programming Manual

Connecting multiple PLC/controllers serially using daisy chaining

The RS485 4-wire and RS485 2-wire communications ports of the HMI5000P/L/HD family support multi-drop

connections. A daisy-chain connection is made from the HMI to the first PLC/controller, and then from the first

PLC/controller to the second and so on (see below). The network may need biasing resistors – refer to the

PLC/controller documentation for more information.

Connecting one or more PLC/controllers via Ethernet

The HMI5000P/L/HD Series have a single RJ45 Ethernet connector configured for 10BaseT and 100BaseT operation.

This port is for both communicating with a PC for configuration purposes, as well as for communicating with

supported Ethernet PLCs and protocols.

The connector is wired just like the RJ45 Ethernet connector on a PC. The Ethernet connection to a PLC/controller will

vary with each PLC/controller. Some will require a straight-through connection, while others require a crossover

connection. See Maple Systems' website for cable drawings of Ethernet cables.

To connect a single PLC/controller to an HMI:

1. Attach one end of the Ethernet cable to the RJ45 connector on the HMI.

2. Attach the other end to the RJ45 connector on the PLC/controller.

A router or switch is required to connect multiple PLCs/controllers to a single HMI. In general, standard straight-

through type cables can be used when connecting to a PLC/controller through a router or switch. Some routers and

switches may be auto-sensing. In this case, either type of cable may be used.

HMI5000P/L/HD

RS-485

PLC

PLC

PLC PLC

1010-1015, Rev. 03