TCL2 18.03.2020 17:40 18.03.2020 17:40

The peripheral modules on the TCL2 bus (e.g. IB-1301) of one PLC Foxtrot configuration (i.e. all peripheral modules controlled by one basic module) must be interconnected via a bus connection, which is plugged in the terminals in the upper left edge of the module (of TCL2 bus, and perhaps also the power supply). The interconnection of the modules MUST be done in a linear fashion (i.e. the modules are connected in series to one after another with no branching), the central module MUST be at one end of the bus, and the other end must be fitted with a terminating resistor 120 Ω or with the KB-0290 bus termination module (it is included in the package of each Foxtrot basic module).

The modules on the TCL2 bus are divided into several groups. Any combination of modules from each group can be connected to one TCL2 bus (with one master), but their total number is limited:



Types of modules

Maximum number of modules per bus TCL2 (TCL2A)

Maximum number of modules per bus TCL2B (only for CP-1003)

Peripheral modules




Communication modules


6 (the sum of both CP-1003 buses)

External master modules

CF-1141, RF-1131

4 (the sum of both CP-1003 buses)

The operator panels


4 (the sum of both CP-1003 buses)


Modules from all groups (for their maximum number see the Table) can be connected to one TCL2 master (the Foxtrot basic module) simultaneously.

An exception is the CP-1003 basic module, which is fitted with two TCL2 masters. Ten peripheral modules can be simultaneously connected to the first (TCL2A) and the second (TCL2B) bus; there can be peripheral modules with the same address on both buses. Modules from the other groups can be arbitrarily connected to both buses, but regarding the number and addresses they act as one bus.

More detailed information about the TLC2 bus, especially its proper use, can be found in the following articles: