How can you combine fail-safe and standard modules in the ET 200 stations?
The following security classes are based on the associated standards:
- for SIL on IEC 62061 / IEC 61511
- for PL on ISO 13849-1:2006
- for category on EN 954-1:1997
Combination of standard and fail-safe modules with ET 200S
If you use the standard output module of the type DC24V/0.5A in combination with power module PM-E F for safe switch-off, you can attain SIL 2PL d/category 3. The standard output modules you can use are given in Entry ID: 39198632.
If you want to have safe switch-off done via a fail-safe output module (F-DO), you can combine standard and fail-safe input/output modules and attain SIL 3/PL e/category 4. However, make sure that you use an appropriate power module PM-E (e.g. 6ES7138-4CB11-0AB0). The SIMATIC Selection Tool (see Entry ID: 26484854) supports you in this.
Combination of standard and fail-safe modules with ET 200M
Refer to the manual "Fail-safe signal modules" (Entry ID 19026151, section 2.3 Configuration with F-SMs in safety mode).
You can also use a combination of fail-safe and standard input/output blocks in an ET 200M station. To attain safety class SIL 3/PL e/category 4 with combined operation in the ET 200M station, you need the isolation module if you are using the following modules of the ET 200M or their predecessor versions.
|SM326, 24DI, fail-safe||6ES7326-1BK01-0AB0|
|SM326, 8DI, NAMUR, fail-safe||6ES7326-1RF00-0AB0|
|SM336, 6AI, fail-safe||6ES7336-1HE00-0AB0|
|SM326, 10DO, fail-safe||6ES7326-2BF01-0AB0|
|SM326, 8DO, fail-safe||6ES7326-2BF40-0AB0|
The isolation module separates the potential groups of the fail-safe and standard modules. In this case, the standard I/O modules must be slotted to the left and the fail-safe modules to the right of the isolation module.
The isolation module must also be used for the above-mentioned modules in SIL3/Cat.4/PLe applications as follows:
- Generally if the F-SMs are used centrally in an S7-300.
- Generally if the PROFIBUS DP is set up with copper cable.
- If the PROFIBUS DP is set up with fiber optic cable with IM 153-2FO and you require combined operation of standard and the above-mentioned F-SMs in an ET 200M.
The following successor modules can be implemented without isolator module up to SIL3/Cat.4/PLe:
|SM326, 24DI, fail-safe||6ES7326-1BK02-0AB0|
|SM336, 6AI, HART, fail-safe||6ES7336-4GE00-0AB0|
|SM326, 10DO, fail-safe||6ES7326-2BF10-0AB0|
|SM326, 8DO, fail-safe||6ES7326-2BF41-0AB0|
Safety Integrated, Mixed operation, PROFIsafe, Distributed Safety mixed operation, Fail-safe, Isolation module, Power module, ET 200 family, DI, DQ, Configuration editor