Connector coding
Siemens supplies a series of coding keys (coding sliders) with each Terminal Module TM15.
To code a connector, you must insert at least one coding slider and cut off at least one coding
projection on the connector:
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Figure 2-6 Procedure for encoding a connector
To avoid incorrect wiring, unique connector coding schemes for the I/O connectors X520,
X521, and X522 may be defined. Examples of possible patterns:
● Different coding between the 3 plugs of a component (i.e., X520, X521, and X522).
● Different component types are encoded differently.
● Identical components on the same machine are encoded differently (e.g. several TM15-
type components).
Terminal Module TM15
2.6 Electrical Connection
TM15 / TM17 High Feature Terminal Modules
Manual, 11/2016 31