Watlow Silver Series - Manual (Page 33)

Connect the HMI to the PLC or Controller 25
Connecting multiple PLC/controllers serially using daisy chaining
The RS485 4-wire and RS485 2-wire communications ports of the Silver Series 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 Silver Series (Ethernet-equipped models) 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.
HMI5000 Series
RS-485
PLC PLC PLC PLC
1010-1007, Rev. 10