Overview
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Within the SIMATIC ET 200 range, ET 200M represents one of the main series of distributed I/O systems for process control applications with SIMATIC PCS 7.
The ET 200M I/O system offers a comprehensive range of I/O modules of S7‑300 design, including ones with special I&C functions:
- Standard analog and digital modules
- Redundant I/O modules
- 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 replaced 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:
- Adding new modules to the station
- Re-configuration of modules
- Addition of ET 200M stations
- Configuration of connected HART field devices with SIMATIC PDM
Note:
Apart from these selected modules, it is also possible to use - with limitations in functions - all other I/O modules from the current range of S7‑300 signal modules.
Design
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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)
- Up to 2 interface modules:
- 1 or 2 (redundant) IM 153-2 High Feature for PROFIBUS DP connection or
- 1 IM 153-4 PN High Feature for PROFINET connection
- Up to 12 I/O modules for connection of sensors/actuators
All I/O modules have optical electrical isolation from the backplane bus. Up to 12 I/O modules can connected to an IM 153-2 High Feature or IM 153-4 PN High Feature interface module. The IM 153-2 High Feature interface modules can also be configured redundantly.
In addition to the standard SIMATIC S7 I/O modules, special I/O modules with diagnostics capability offer the following functions, among others:
- Channel-based diagnostics, e.g. open-circuit, short-circuit, limit violations
- Internal module monitoring, e.g. configuration error, RAM error, tripped fuse
- Flatter monitoring for sensors
- Pulse stretching
- Output of a programmable substitute value on failure of the central unit
In the event of a fault, the modules with diagnostics capability automatically pass on the corresponding message to the operator station, permitting fast and simple troubleshooting.
The ET 200M stations can be operated in standard environments as well as in Ex zone 2. The actuators/sensors can be positioned in Ex zone 1/21 when suitable Ex input/output modules are used. Hot swapping of I/O modules within Ex zone 2 is allowed with the right permit (e.g. fire certificate).
Technical specifications
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You can find detailed technical data on the ET 200M and S7‑300 I/O modules in the following places:
- Catalog ST 70, Chapter "IO Systems" or
- Industry Mall/CA 01 under "Automation technology - Automation systems - SIMATIC industrial automation systems - IO systems - SIMATIC ET 200 systems for control cabinets" – SIMATIC ET 200M"
Options
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SIPLUS extreme range for extended temperature ranges and corrosive environments
The "standard" properties of an individual device or system are often insufficient for harsh environmental conditions, applications 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 include:
- 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 classified according to their special properties on the Internet. The corresponding SIPLUS product is assigned there to the standard product:
http://www.siemens.com/siplus
Note:
SIPLUS products are also included in the ST 70 Catalog.