Siemens AS 488/TM manual Data couplings with other systems, 10/2

This catalog is out of date, see note on page 3

Data couplings with other systems

Introduction

Data couplings

Interface module	Type of coupling	Interface	Procedure	Electrical	Coupling partner
				isolation
IF 964-DP	Data bus connection	PROFIBUS	FDL	Yes	SIMATIC S5 programmable controllers with
					CP 4531 or CP 451 communications proces-
					sor, S5-95U
IF 964-DP	Data bus connection	PROFIBUS	FDL	Yes	SIMATIC S7-400 programmable controllers
					with CP 443-5 communications processor
IF 964-DP	Data bus connection	PROFIBUS	FDL	Yes	SIMATIC S7-300 programmable controllers
					with CP 342-5 or CP 343-5 communications
					processor
IF 964-DP	Data bus connection	PROFIBUS	FDL	Yes	Systems from other vendors, PC with CP 5613
					communications processor
6DS1 333-8AB	Serial multipoint connection	TTY	3964R/ RK 512	Yes	SIMATIC S5 programmable controllers with
					CP 544 communications processor
6DS1 333-8AB	Serial multipoint connection	TTY	3964R/ RK 512	Yes	SIMATIC S7-400 programmable controllers
					with CP 441-2 communications processor
6DS1 333-8AB	Serial multipoint connection	TTY	3964R/ RK 512	Yes	SIMATIC S7-300 programmable controllers
					with CP 341 communications processor
6DS1 333-8AA with spe-	Serial multipoint connection	TTY	MODBUS	Yes	Special product for 4 x 9 stations/devices from
cial EPROM M1328-V6	or data bus connection				other vendors with MODBUS functions
					Special product on request

■Overview

A basic differentiation is made for data coupling of the AS 488/TM with other systems between:

•System couplings via PROFIBUS as the data bus and

•direct couplings via special interface modules.

The overview table shows the current interfaces for system and direct couplings together with the most important features of the interface modules.

Interface modules are operated in a slot for I/O modules or in an extension unit of the CPU (EXM 478).

With the serial coupling, the interface modules automatically handle data transfer with the coupling partner. Data transfer for the serial coupling is via the transfer RAM of the interface modu- le and the process image of the AS 488/TM. With the alternative data bus coupling with PROFIBUS, the data are transferred bet- ween the drivers and the respective coupling partners via the special AG/AG coupling software in the AS operating system and the interface module.

When selecting the type of coupling suitable for the respective application, the following factors can also be important in addi- tion to the type of coupling partner:

•Distance from coupling partner

•System topology, number of partner systems, and type of part- ner system

•Earthing concept and lightning protection measures

•Migration strategy: retention of existing configuration, or recon- figuration

•Performance

If the coupling is between different buildings or over large dis- tances within buildings, it is recommendable for potential diffe- rence reasons to use optical transmission techniques (fiber- optic cables) for the PROFIBUS connection or to alternatively use a serial coupling.

The serial coupling supports any protective measures against static and dynamic potential differences (earthing, lightning pro- tection) because of the low number of conductors and electrical isolation. The data transmission rate can be varied within certain limits for this type of coupling. On the one hand, this influences the transmission rate and thus the cycle time, in addition the se- lected data transfer rate has an influence on the maximum dis- tance which can be covered.

The drivers of block type S5KE/S5KS required for system and di- rect couplings are components of the standard system software in the case of the serial coupling. For the AG/AG coupling via PROFIBUS as the data bus, extended S5KE/S5KS drivers are provided as components of the optional AG/AG coupling softwa- re for downloading.

Coupling with systems from other vendors

The serial coupling with interface module 6DS1 333-8AB can be used for coupling systems from other vendors (scales, data col- lectors, process chromatographs etc.). A prerequisite is that the- se systems have a 20-mA current loop interface (TTY) and support the 3964R protocol and the RK 512 procedure. Other protocols and procedures for the serial coupling are not suppor- ted (exception: systems with MODBUS procedure). Coupling of devices from other vendors with MODBUS procedure is availab- le as a special product on request.

10/2 Siemens PLT 112 · 2002