ET 200SP：overview

SIMATIC ET 200SP is a scalable and highly flexible distributed I/O system for connecting process signals to a higher-level controller via a fieldbus.

The SIMATIC ET 200SP distributed I/O system is installed on a mounting rail. It consists of:
● CPU/interface module
● Up to 64 I/O modules, which can be plugged into BaseUnits in any combination
● Up to 31 motor starters
● A server module that completes the configuration of the ET 200SP.

① CPU/interface module
② Light-colored BaseUnit BU..D with infeed of supply voltage
③ Dark-colored BaseUnits BU..B for extending the potential group
④ BaseUnit for motor starter
⑤ Server module (included in the scope of delivery of the CPU/interface module)
⑥ ET 200SP motor starter
⑦ I/O module
⑧ BusAdapter
⑨ Mounting rail
⑩ Reference identification label

Fail-safe automation systems and fail-safe modules

Fail-safe automation systems (F-systems) are used in systems with higher safety requirements. F-systems control processes and ensure that they are in a safe state immediately after shutdown. In other words, F-systems control processes in which an immediate shutdown does not endanger persons or the environment.

Fail-safe modules

The key difference between fail-safe modules (F-modules) and standard modules is that they have an internal two-channel design. This means the two integrated processors monitor each other, automatically test the input and output circuits, and switch the fail-safe module to a safe state in the event of a fault.
The F-CPU communicates with a fail-safe module via the safety-related PROFIsafe bus profile.

Fail-safe motor starters

Fail-safe motor starters enable safety-related tripping of motor loads. Fail-safe motor starters are not PROFIsafe nodes. Motor starters operate together with the fail-safe modules of the ET 200SP system.

Area of application of ET 200SP with fail-safe I/O modules

By using the ET 200SP distributed I/O system with fail-safe I/O modules, you are replacing conventional safety engineering configurations. This includes the replacement of switching devices for emergency STOP, protective door monitors, two-hand operation, etc.

SIMATIC Safety F-system with ET 200SP

The figure below shows an example of a configuration for a SIMATIC Safety F-system with ET 200SP distributed I/O system and PROFINET IO. 
Fail-safe I/O modules and non-fail-safe I/O modules can be combined in an ET 200SP configuration.
The fail-safe IO controller (F-CPU) exchanges safety-related and non-safety-related data with fail-safe and non-fail-safe ET 200SP modules.

The following fail-safe I/O modules are available for the ET 200SP distributed I/O system:
● Fail-safe power modules are used to supply the potential group load voltage and for the safety-related tripping of the load voltage for non-fail-safe output modules.
● Fail-safe digital input modules detect the signal states of safety-related sensors and send the relevant safety frames to the F-CPU.
● Fail-safe digital output modules are suitable for safety-related shutdown procedures with short circuit and cross-circuit protection up to the actuator.

Fail-safe motor starters are suitable for safety-related tripping of motor loads.

Example of a configuration with fail-safe I/O modules

① Interface module ② Light-colored BaseUnit BU..D with infeed of supply voltage ③ Dark-colored BaseUnits BU..B for conducting the potential group further ④ I/O module ⑤ Server module (ships with the interface module) ⑥ Fail-safe I/O modules ⑦ BusAdapter ⑧ Mounting rail ⑨ Reference identification label