Siemens appendix Basic cabinet, AS 235 automation system, Basic unit

This catalog is out of date, see note on page 1

AS 235 automation system

The AS 235 automation system is the cabinet version of the

range. It can be ordered in the form of two ordering units: basic

cabinet and extension cabinet:

The basic cabinet is the main component of the AS 235 automa-

tion system. It contains all components required for the AS 235

system to function. It can therefore also be used on its own, i.e.

without an extension cabinet.

The extension cabinet increases the number of slots for I/O mod-

ules. It can only be operated in conjunction with the basic cabi-

￿net with up to 3 extension units. When using an extension cabi-

Automation systems

AS 235

Basic cabinet

Communication

via CS 275 plant bus

GE		M
SV	SV
		L

6 I/O	ZE
modules

	net it is possible to increase the number of slots for I/O modules
	in the basic cabinet (48) up to a maximum of 90.
￿	Basic cabinet
	The basic cabinet consists of the following main components:
	Basic unit
	The basic unit of the AS 235 automation system consists of:
	• Subrack
	– For wire-wrap system	6DS9 026-8AB
	– For Maxi-Termi-Point system	6DS9 026-8AA
	• Power supply subrack with
	– Slots for power supply and
	logic modules and
	– 6 slots for I/O modules
	• Power supply module
	– DC 24 V / DC 24 V	C79451-A3260-A25
	– DC 24 V / DC 5 V	C79451-Z1359-U9
	• Alarm logic module	6DS1 901-8BA
	• Central processing unit with

– Central processor module	6DS1	140-8AA
– EDC memory module 4000 Kbyte	6DS1	844-8FA

I/O bus
EE
14 I/O	MO
modules	(max. 6)

DR	Printer
		PBT, ST
EE	Extension unit
GE	Basic unit
ML	Alarm logic module
MO	Monitor
PBT	Process operation keyboard DR
ST	Configuring keyboard
SV	Power supply module
UI	Bus converter
ZE	Central unit

MO

– Backup battery for memory module	W79084-U1001-B2
– AS 235 system software, version G	6DS5 323-8AG
– Interface module for I/O bus 1	6DS1 312-8BB
• Interface module for mini floppy disk unit	6DS1 326-8BB
• Interface module for operation channel 1	6DS1 330-8CA
• Bus terminator module	C79458-L445-B20
• Cable duct, 2 U high	6DS9 906-8AB
• Cover with wiring duct	6DS9 927-8AA
• Cable set for power supply and alarms	6DS9 908-8CA

Fig. 3/2 AS 235 automation system, system configuration

The alarm logic modules monitor the voltages L+, PM (DC 24 V each) and +5 V as well as the I & C signals for overtemperature, door contacts, fan contacts and spare contacts, and trigger the current lamps.

The central processor is especially tailored to the processing of closed-loop and open-loop control tasks and to the TML pro- gramming language. It divides the RAM and differentiates access operations to

The subrack for the basic unit of the AS 235 system corresponds to the ES 902 system and is 10 U high. It is the supporting sys- tem for the other components of the basic unit, the interface modules for the local bus, and the I/O modules. The process sig- nal lines for the 6 I/O modules are connected to the rear, the plug connectors are equipped with wire-wrap or Multi-Termi-Point connections.

If the process signal cables leading to I/O slot 6 are to the con- nected in the cabinets also using the Maxi-Termi-Point system, conversion is necessary using SAE cabinet connection ele- ments. These must be ordered separately.

The power supply module C79451-A3260-A25 is used to supply the basic unit with DC 24 V. The DC 24 V supply voltage is fil- tered and additionally fused on this module. Two process oper- ation keyboards and a mini floppy disk unit can be powered with DC 24 V via 3 sockets on the front of the module.

The basic unit is equipped with 1 or 2 alarm logic modules depending on the configuration of the automation system. The alarm logic module ML1 is assigned to the basic cabinet. The alarm logic module ML2 is only required if the AS 235 system consists of a basic cabinet and an extension cabinet and has a basic unit with wire-wrap pins. In the case of the basic unit with Maxi-Termi-Point system, the tasks of the alarm logic module ML2 are handled by the interface module for I/O bus 2.

•the 1-Mbyte system RAM with battery backup for all fixed sys- tem data and programs,

•the 4000-Kbyte RAM with battery backup for all user programs and data and for variable system data, and

•the transfer memories of the interface modules for I/O bus, operation channel, mini floppy disk unit and local bus.

The memory module with Error Detection and Correction EDC can correct a 1-bit error when reading, and eliminate it in the memory cell together with the system software.

The interface module for I/O bus establishes the connection between the 8-bit central unit bus and the I/O bus. One or two of these modules can be plugged into the basic unit of the AS 235 system:

•The interface module for I/O bus 1 (A) supplies the I/O modules plugged into slots 1 to 5 of the basic unit and the 3 extension units of the basic cabinet. It is always required, and belongs to the standard delivery of the basic unit.

•The interface module for I/O bus 2 (B) must the ordered as an option. It connects slot 6 for I/O modules in the basic unit and the 3 extension units of the extension cabinet to the central pro- cessing unit via I/O bus 2 (B). It is therefore only required if slot 6 in the basic unit is to be used, or if an extension cabinet is used in addition to the basic cabinet.

Siemens PLT 111 · 1999 3/3