Siemens 353 User Manual page 15

UM353-1B
When even more I/O is needed for multiple-loop applications, advanced control, or batch sequencing, Modbus/TCP
Ethernet can be used to connect remote I/O. The standard Ethernet capability of the 353 provides connectivity to a
large selection of standard Modbus/TCP Ethernet I/O products that provide analog inputs and outputs and digital
inputs and outputs using solid state technology.
Although the Siemens 353 can be connected to and operated entirely from a central operator workstation, such as
i|station, a controller faceplate is included. This local operator interface is for applications where loops need
individual attention during startup, troubleshooting, maintenance, or emergency conditions. The convenient
faceplate layout and sophisticated software allow process and configuration changes to be made quickly and easily.
The controller can be completely configured from the operator faceplate or, as mentioned above, configured
remotely using i|config, the optional PC-based Graphical Configuration Utility. A MultiMediaCard (MMC) can be
used to transfer a configuration from one controller to another or between a PC running i|config and a controller
when downloading a configuration over a network is not available.
Network communication options are listed in the following table.
Protocols
Modbus
Modbus/TCP Ethernet
Ethernet supports uploading and downloading of controller configurations over the Ethernet LAN. For example, if
i|config Graphical Configuration Utility is loaded on the local client shown in Figure 1-2, controller configurations
can be developed on the client, or uploaded from the controller for editing, and then downloaded to the controller.
Data can also be acquired from remote servers for the purpose of archiving and/or data mining.
The Ethernet-Modbus Bridge in Figure 1-2 accepts an Ethernet data command from the controller and outputs an
equivalent Modbus command to a Modbus device at address 1. The returning Modbus data is embedded by the
bridge in an Ethernet packet to be sent to the requesting controller.
Regardless of the selected communication option, the RS232 port on the underside of the Display Assembly will
communicate using Modbus.
For small retrofit applications, the Siemens 353 with operator faceplate is a replacement for a simple stand-alone
single-loop controller. It is easily upgraded with additional local I/O for advanced control strategies. Ethernet can
extend the I/O capability of the controller ever further in data acquisition applications.
Multiple Siemens
353 and Procidia
353R Nodes,
April 2012
Available Connection
Standard Rear Terminals, NCA and NCB
Standard Rear Panel, RJ-45 (case option 4)
Ethernet network with switches, hubs, routers,
and gateways as needed for network connections
Siemens SIREC
Recorder
Ethernet Capable
I/O Modules
Figure 1-2 Ethernet Architecture Example
Option Board Needed
None
None
Modbus
Ethernet-Modbus Foreign Device with
Bridge
Modbus Communications
Introduction
i|station
(i|config)
1-3