Download B - Schneider Electric

7
Setting into Service
7
Connecting the Module
7.3-4
Wiring Precautions
Principles
To protect the signals from induced noise in serial and common modes, the
following precautions should be observed:
B
Type of cables
The minimum wire cross-sectional area in the cables used should be
0.22 mm2 (AWG 24).
Shield grounding
a) For Sub-D connectors:
● Connect the shields together,
● Crimp the shield in the metal coated
plastic connector case,
b) For TSX BLK 4 terminal blocks
(TSX AXM 172 modules)
● Connect the shielding of the cables
to the PLC ground through the
TSX RAC 20 grounding strip that
must be installed on the PLC rack (except for the analog output, the
connection should be made directly to the connector).
Grouping the cables in bundles:
Bundles of multiple twisted pair cables can be formed where the signals
carried are of the same type and have the same reference to ground.
Cable routing:
● Keep the counting signal wires away from the discrete I/O wires, (especially
relay output wires) and power cables,
● Avoid close parallel runs (the cables should be at least 20 cm (8 inches)
apart). Make any crossings at right angles.
Connecting the inputs
Compatibility with incremental encoders
Inputs In0, In1, In2 are designed to receive signals from an incremental
encoder.
The encoders used must have:
• An NPN open collector or totem-pole output when used with a TSX AXM 172
module (5 V or 24 V supply),
• A line transmitter (RS-422) when used with TSX AXM 182 / 162 modules
(5 V supply).
Telemecanique has a complete range of rotary and incremental encoders
that are compatible with TSX AXM modules.
Note:
7/10
TSX AXM 172 modules are not designed to operate with differential output
encoders (signals AA, BB, ZZ).