Siemens Welding System ST PCS 7 Benutzerhandbuch

ET 200M distributed I/O

Siemens ST PCS 7 · November 2007

11

■

Within the ET 200 range, ET 200M represents the main series 

of distributed I/O systems for process control applications with 

SIMATIC PCS 7. 
The ET 200M has a versatile range of I/O modules of S7-300 de-

sign, including ones with special I&C functions.
• Standard analog and digital modules
• Redundant I/O modules (DI 16 x DC 24 V, with diagnostics 

capability; DO 32 x DC 24 V/0.5 A; AI 8 x 12 bit)

• I/O modules with enhanced diagnostics capability
• Ex I/O modules
• Controller and counter modules
• HART modules
• F-modules for safety-related applications
When using active bus modules, faulty I/O modules can be re-

placed while the plant is in operation (RUN) without influencing 

adjacent modules (hot swapping function). 
The following actions are possible with the automation system in 

RUN:
• Addition of new modules within a station
• Reparameterization of modules
• Addition of ET 200M stations
The connected HART field devices can be parameterized using 

SIMATIC PDM.

Apart from these selected modules it is also possible to use - with limita-

tions in functions - all other I/O modules from the current range of S7-300 

signal modules.

■

An ET 200M remote I/O station comprises: 
• 1 or 2 (redundant) power supply modules (can be omitted in 

the case of a central 24 V DC supply for the plant)

• 1 or 2 (redundant) IM 153 interface modules for connection via 

PROFIBUS DP with transmission rates of up to 12 Mbit/s

• Up to 12 I/O modules for connection of sensors/actuators
All I/O modules have optical electrical isolation from the back-

plane bus. Up to 12 I/O modules can be connected to an 

IM 153-2 High Feature interface module, or up to 8 to an IM 153-

2 FO High Feature interface module. The interface modules can 

also have a redundant design if required.

In addition to the standard SIMATIC S7 I/O modules, special 

I/O modules with diagnostics capability offer the following func-

tions, among others:
• Channel-based diagnostics, e.g. open-circuit, short-circuit, 

limit violations

• Internal module monitoring, e.g. parameterization error, RAM 

error, tripped fuse

• Flatter monitoring for sensors
• Pulse stretching
• Output of a selectable substitute value on failure of the central 

processing unit

In the event of a fault, the modules with diagnostics capability 

automatically pass on the corresponding message to the opera-

tor station, permitting fast and simple troubleshooting.
The ET 200M can be used in standard environments and also in 

Ex zones 2 and 22. The actuators/sensors can be positioned in 

Ex zones 1 and 21 when suitable Ex input/output modules are 

used. Hot swapping of I/O modules within Ex zone 2 and 22 is 

allowed with the right permit (e.g. fire certificate).

■

You can find detailed technical data on the ET 200M and S7-300 

I/O modules 
• in Catalog ST 70 or 
• in the Mall / Catalog CA 01 under "Industrial automation sys-

tems / Controllers / SIMATIC S7"

■

The "standard" properties of an individual device or system are 

often insufficient for harsh environmental conditions, applica-

tions in corrosive environments or extreme temperature ranges. 

Depending on the location of use, the result could be limitations 

in functionality or operational safety or even total failure of the 

plant.
The SIPLUS extreme range offers individually adapted standard 

products which permit retention of the functionality of your plant 

or process even under extreme conditions of use. These in-

clude:
• Ambient temperature range from -25 to +60/+70 °C 
• Condensation, high humidity 
• Increased mechanical stress 
• Extreme loading by media, e.g. toxic atmospheres 
• Voltage ranges deviating from the standard 
• Increased degree of protection (dust, water) 
You can find a summary of the available range of products clas-

sified according to their special properties on the Internet. The 

corresponding SIPLUS product is assigned there to the stan-

dard product. Note: SIPLUS products are also included in the 

Catalog ST 70.
Additional information is available in the Internet under:

http://www.siemens.com/siplus

© Siemens AG 2007