In the previous article, we discussed the Terminal Module of Siemens ET200S, focusing on the Power Module, identified by the letter "P" in its name, such as "TM-P15S22-01." In today's article, we will delve into another type of Terminal Module – the Electronic Module backplane.
The Electronic Module backplane is designed to connect modules like input/output (digital and analog) and functional modules. Its nomenclature follows the same rules as the Power Module backplane. Taking "TM-E15S23-01" as an example, "TM" stands for "Terminal Module," "E" indicates the Electronic Module, "15" signifies a width of "15mm" for connecting electronic modules, "S" denotes the fixation method as Spring, and "23" indicates the number of terminals as "2X3 (two rows, each with three)." For instance, "TM-E15S24-01" has the difference of having "2X4 (two rows, each with four)" connecting terminals, as illustrated below:
The backplane module TM-E15S26-01 features a total of 12 connecting terminals. In addition to terminals 1 to 8, it includes four additional terminals. On the left side, from top to bottom, these are labeled A4 and A3, while on the right side, from top to bottom, they are labeled A8 and A7. All four additional terminals are connected to the AUX1 bus, linking with the AUX1 bus of the Power Module backplane (for more details on AUX1, please refer to the previous article), as illustrated below:
The Universal 30mm backplane module for ET200S, such as TM-E30S46-A1, is designed for 30mm-wide modules. It features four rows of connecting terminals: the leftmost are numbered 1 to 4, and the rightmost are numbered 13 to 16. Additionally, it includes 8 auxiliary connecting terminals arranged as follows, from left to right and top to bottom: A4|A8, A3|A7, A12|A16, A11|A15. All these auxiliary connecting terminals are linked to the AUX1 bus, as depicted in the illustration below:
In addition to the Universal 30mm backplane module, there is another type designed specifically for connecting 30mm fault-tolerant safety modules: TM-E30S44-01. The key distinction lies in the absence of auxiliary connecting terminals, as illustrated below:
Having provided an extensive overview, let's delve into how the terminal connections on the backplane modules are defined and how wiring is carried out. In essence, the backplane modules themselves do not prescribe a fixed definition for terminal connections. The wiring methodology is contingent upon the type of signal module inserted into them.
For instance, taking TM-E15S26-01 as an example, if a digital input (DI) module is inserted, terminal 1 will be used to connect external digital input signals. Conversely, if a digital output (DO) module is inserted, terminal 1 will be utilized to connect external digital output signals. Naturally, depending on the type of signal module being connected, there will be various wiring configurations. In the upcoming article, we will specifically discuss the wiring methods for backplane modules.
This concludes the introduction to the selection of backplane modules. For further reference, please see the related article: "How to Select Siemens ET200S Backplane Modules (Part 1)."