Siemens AS 488/TM manual System software, User function blocks, Standard function blocks

This catalog is out of date, see note on page 3

System architecture

System software

■User function blocks

Overview

A separate memory card with system software is required for each automation system. The system software of the AS 488/TM is completely present on this memory card, and only executes there. The software is reloaded each time the system is switched on or reset. The memory card is divided into a system memory and a user memory. The system memory is read-only, and con- tains the system software in the form of basic programs and standard function blocks.

The memory card is inserted into a special slot in the automation system’s CPU. It must not be removed during operation, it must remain permanently inserted in the CPU.

Standard function blocks

Dedicated function blocks, the so-called standard function blocks, are available in the automation systems for solving con- trol engineering tasks. The AS 488/TM system contains the same standardized function blocks as the AS 235 automation system for measured-value acquisition, closed-loop control, open-loop control, calculation and monitoring.

Supported by the powerful PROGRAF AS graphic configuring tool, the standard function blocks present in the system software are activated by means of configuring instructions and linked into an automation structure which is partially processed cycli- cally by the automation system’s CPU, and partially also acycli- cally.

The standard function blocks of the AS 488/TM system are listed in the tables under "Configuring". Blocks have been omitted which are still in the system software for compatibility reasons but have no significance any longer for applications with the AS 488/TM.

Optional function blocks

Various preconfigured standard software packages are avail- able which can be subsequently loaded and executed on the AS 488/TM. Compatibility with the AS 488/TM system software is guaranteed for the following packages:

AG/AG coupling	Standard data coupling of SIMATIC S5/S7,
	SIMATIC PCS 7 as well as devices from other
	vendors via the PROFIBUS-AG/AG bus sys-
	tem
SIWAREX M	Standard driver for the SIWAREX M weigh-
(driver)	ing/dosing unit as distributed I/O on
	PROFIBUS-DP
ZEIT	Utilization measuring program for all AS
	cycles
FENS	Reloadable window block for diagnostics of
	module data on PROFIBUS-DP
Special blocks	On request; including optional special driver
	blocks for use with SIMOVERT, MICRO-
	DRIVES, SIPART DR, FM 350, CEAG devices

If the standard function blocks are insufficient to fulfil the control, operation, monitoring and communication tasks, the TML pro- cess language (TELEPERM M Language) can be used for ana- log and binary processing operations, and the STEP M control language for binary logic operations. TML and STEP M can be used to define new function blocks optimally tailored to the re- spective automation task.

Functions which can only be solved with difficulty using stan- dard function blocks, e.g. optimization, startup and shutdown, or open-loop controls, can be solved more simply using these op- timized function blocks.

TML language

TML is used to produce more complex blocks for comprehen- sive analog, binary and character processing functions with in- dividual test and processing algorithms. TML is particularly suitable if many functions of the same type are to be linked with different signals, addresses or parameters (multiplex system).

STEP M language

Binary functions such as linking, saving and time delays are re- quired for sequential and logic controls. The main component of STEP M is the logic operation with which scanning, linking, set- ting, resetting and assignment instructions can be formulated.

Parts of the program which are used repeatedly can be trans- ferred into subroutines.

Note:

The following software packages can also be used, but are no longer actively marketed:

•SIGRID TM V5 (basic process engineering functions and basic function elements)

•BATCH X-TM (program system for automation of recipe-con- trolled batch processes)

•FUZZY TM (configuration of fuzzy controls)

The SIGRID TM V5, BATCH X-TM and FUZZY TM function blocks belong to software class C.

2/4 Siemens PLT 112 · 2002