Siemens AS 235 appendix General technical data, Configurable I/O modules

This catalog is out of date, see note on page 1

I/O modules

I/O modules

Summary of properties

•High-availability, autonomous power supply for each I/O module; integrated power supply for transmitters

•Modules can be replaced during operation

•Comprehensive self-test routines on the modules

•Mutual test in dialog with the associated driver

•Fault diagnosis using I & C alarms, channel-spe- cific up to the transmitter or final control element

•Tailored driver block for each type of module

•High electromagnetic compatibility;

field inputs and outputs destruction-proof to IEC 255-4, Class II

•Selectable backup response of modules

•Configurable modules for processing indepen- dent of central unit

			Summary
	General technical data
	Power supply L+
	Rated voltage		DC 24 V
	Permissible range		20 to 33 V including superim-
			posed ripple
	Permissible superimposed		15 % of mean value of DC voltage
	ripple Upp
	Limiting range of use		35 V, max. 500 ms
			45 V, max. 10 ms
	Voltage dip		0 V, max. 5 ms;
			recovery time min. 10 s
	Process interface
￿• Binary signals
	DC voltage		Referred to potential M
	Signal definitions
	– Inputs	L (low)	-33 to +4.5 V
		H (high)	+13 to +33 V
	– Outputs	L (low)	0 to 3 V
		H (high)	L+ to (L+ - 2.5 V)
	Input currents		0.5 mA
	Process signals
			4 mA
	Output currents with DC 24 V		Max. 8.5 mA
	Power signals	Type 1	Max. 100 mA
		Type 2	Max. 400 mA
		Type 3	Max. 800 mA

Binary output signals are short-circuit-proof and overload-proof and can be connected in parallel.

Configurable I/O modules

Function modules generally have a configuration which is defined by their firmware and which can be modified to a certain extent by plug-in jumpers (e.g. inversion of manipulated vari- able, internal/external definition of setpoint etc.).

The standard system software of the AS 235 automation system also contains driver blocks for configurable function modules from the device spectrum of the TELEPERM ME process control system for power plants. In this case, the firmware of these mod- ules contains an interpreter which processes a user configura- tion generated using defined blocks. This user configuration is produced on a personal computer in the STEP M (BG) language, loaded into the module via a serial interface, and stored in an

EEPROM.

This principle enables the implementation of highly flexible, indi- vidual concepts on the modules for process-oriented prepro- cessing with direct intervention into the process whilst bypassing the automation system. Likely applications are e.g. balanced backup structures or particularly time-critical process operations.

An example of a configurable signal module is the analog input module 6DS1 731-8RR for temperature signals. The required data on the type of transmitter, measuring range, cold junction etc. must be defined by configuring for the input channels (max. 32, basic module and 2 extension modules). The config- uring data for this module are stored in a flash-PROM.

The STRUK-AS 220 EA program is required for loading/config- uring (see page 4/6).

• Analog signals
DC voltage	Referred to MZ
Rated range of use	-10 to	+10	V
	-10 to	0	V
	0 to	+10	V
– Overflow range	-10,5 to +10,5 V
– Input impedance	100 kΩ ≤ Ri		≤ 1MΩ
– Output loading capacity	3 mA
Direct current	Referred to M
– Rated range of use	0 to 20 mA or
	4 to 20 mA
– Rated input impedance	50 Ω
– Rated output load	600 Ω

All analog output signals are short-circuit-proof and overload-proof

Siemens PLT 111 · 1999 4/3