Chapter 2: Installation
2X-A Series Installation Manual 31
Connections
Recommended cables
Recommended cables for optimal system performance are shown in the table
below.
Table 14: Recommended cables
Cable requirements Max. cable length
3 × 1.5 mm
2
N/A
0.13 to 3.31 mm² (12 to 26 AWG) shielded or
unshielded twisted-pair (52 Ω and 500 nF max.) [1]
2 km [2]
(900
protocol)
0.13 to 3.31 mm² (12 to 26 AWG) twisted-pair
(52 Ω and 500 nF max.) [1]
2 km [2]
0.13 to 3.31 mm² (12 to 26 AWG) twisted-pair,
CAT5
1.2 km
CAT5, CAT5e, or CAT6 30 m [3]
Standard USB cable with A-B connectors 10 m
Accessory cable 2010-2-232-KIT [4] 3 m
Ω per wire.
[2] Maximum cable length depends on the
type of cable used and the loop load.
[3] Connect the control panel to an Ethernet
switch installed within 30 m if greater distances are
[4] This kit contains a 3 m cable and the 2010
-2-232-IB isolation board required for external
RS-232 device connections.
Other types of cable may be used subject to site-specific electromagnetic
interference (EMI) conditions and installation testing.
Using shielded loop cable
Shielded cable provides more flexibility in solving site-specific EMI problems and
is recommended, subject to following these guidelines:
• Use a multimeter to check that the shield is fully isolated from earth, the loop
positive, and the loop negative lines before connecting the shield to a single
point in the installation. The same isolation must be provided for any other
site wiring and loop cabling should avoid any known sources of EMI at the
site.
• Use the earth studs in the control panel cabinet for termination. See “Cabinet
and PCB layout” on page 19 for the location of the earth studs.
The PCB terminal earthing connections only improve noise immunity in very
specific environmental conditions. In some cases, leaving the earth fully
isolated provides the best protection against EMI.
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