Siemens AS 235 appendix Summary of system properties

This catalog is out of date, see note on page 1

System architecture

STEP M

In addition to the function blocks for binary processing, the

AS 235/235 H/235 K systems can use the STEP M control lan- guage, without leaving the block configuration, in order to formu- late extensive and complex open-loop control tasks.

TML language

The TML process language can be used in addition to the firm- ware blocks for special tasks. It can be used to format special function blocks and to implement particularly complex functions, e.g. for the mixing of binary value arithmetic and measured value arithmetic.

Operation and monitoring

The AS 235, AS 235 H and AS 235 K systems have either one or two autonomous operation channels for local operation and monitoring. This means that process operation keyboards, print- ers and process monitors can be connected in duplicate and operated using operation/monitoring functions which are inde- pendent of one another. Some of the local operation devices can be omitted in the case of central operation and monitoring with a network configuration.

Scope of performance

The user RAM of the automation systems has a memory capacity of 4,000 Kbytes. This means that even one single system can already implement larger automation tasks. Even the data quan- tities encountered with extensive batch processes can be han- dled. If it is taken into account that various tasks occur mixed together, the performance is approximately as follows:

•30 to 80 control loops

•50 to 120 additional analog-value monitoring functions

•5 to 15 sequential controls

•100 to 250 logic controls

•Any number of flow charts (up to 8 colors) and individually designed logs.

Performance characteristics

Summary of system properties

•Automation system for autonomous operation with local communication or for network operation with central communication

•Fitted in wall housing or cabinet

•Configurable within wide limits

(up to 114 I/O modules depending on system)

•User memory up to 4,000 Kbytes on one module

•32-bit processing of analog values

•Optimized data transfer rate resulting from separate processing of analog and binary values

•Central unit redundant as option with synchronous pro- cessing of clocks (AS 235 H)

•Operation without fans possible

•Complete range of standard function blocks

•User function blocks with convenient TML program- ming language, also STEP M programming language for open-loop control tasks

•Configuring/programming either online without pro- grammer (using lists) or with PC (using graphics)

•Local or central configuring (via bus)

Siemens PLT 111 · 1999 2/3