The figure below summarizes the maximum distances authorized for the different bus X segments and bus X extensions:
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for each bus X segment (X1, X2 or X3): maximum length 100 meters,
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for each bus X extension (XD1 or XD2): maximum length 250 meters,
Illustration:
Taking this into account, the maximum distance possible between the processor and the remote modules is 350 meters.
This distance of 350 meters is only possible for single discrete input/output modules. The following illustrations indicate the restrictions in relation to module type.
NOTE: Extension is prohibited for communication modules TSX SCY •••/TSX ETY•••/TSX IBY •••/TSX PBY •••. These modules must be located on the main segment of the bus X1
Safety and single discrete I/O modules
Illustration:
Mixed discrete I/O, analog, application-specific and bus sensor/actuator modules
Illustration:
NOTE: for the following modules:
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TSX DEY 16 FK with PV index≥ 06,
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TSX DMY 28FK / 28RFK,
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TSX AEY 810/1614,
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TSX ASY 410 with PV index ≥ 11,
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TSX ASY 800,
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TSX CTY 2C
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TSX CAY 22/42/33,
maximum distance authorized (extension cable and bus X cable length): 225 meters.
Illustration:
CAUTION 
