User's Manual

Siemens PLT 111 · 1999
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System architecture
Performance characteristics
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 cas
e 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.
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)
This catalog is out of date, see note on page 1