Rockwell Automation MD65 User Manual Version 2.0 - Manual (Page 37)

Installing Control Wiring 6-3
6.3 I/O Wiring Recommendations
6.3.1 Maximum Control Wire Length
Recommendations
Do not exceed control wiring length of 30 meters (100 feet). Control
signal cable length is highly dependent on electrical environment
and installation practices. To improve noise immunity, the I/O
terminal block Common must be connected to ground terminal/
protective earth. If using the RS485 port, Terminal 19 should also
be connected to ground terminal/protective earth.
Table 6.1 – Recommended Control and Signal Wire 1
1 If the wires are short and contained within a cabinet that has no sensitive circuits,
the use of shielded wire may not be necessary, but is always recommended.
Wire Type(s) Description
Minimum
Insulation
Rating
Belden 8760/
9460 (or equiv.) 0.8 mm 2 (18AWG), twisted pair, 100%
shield with drain.
300 V
75° C
(167° F)
Belden 8770
(or equiv.) 0.8 mm 2 (18AWG), 3 conductor,
shielded for remote pot only.
Table 6.2 – I/O Terminal Block Specifications
Maximum Wire Size 1
1 Maximum / minimum that the terminal block will accept. These are not
recommendations.
Minimum Wire Size 1 Torque
1.3 mm 2 (16 AWG) 0.13 mm 2 (26 AWG) 0.5 to 0.8 Nm
(4.4 in-lb to 7 in-lb)