Installing Control Wiring 6-3
Important: I/O terminals labeled “Common” are not referenced to
the safety ground (PE) terminal and are designed to
greatly reduce common mode interference.
6.3 I/O Wiring Recommendations
6.3.1 Maximum Cable 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 16 should also
be connected to ground terminal/protective earth.
!
ATTENTION: Driving the 4-20 mA analog input from
a voltage source could cause component damage.
Verify proper configuration prior to applying input
signals.
Table 6.1 – Recommended Control and Signal Wire
1
1
If the wires are short and contained within a cabinet which 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
60° C
(140° 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)
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