42/24-10 EN Rev. 9 Chapter 4: Electrical Connection 4-13
Signal, Control and Interface Line Connection
CAUTION!
Follow local regulations on installing and connecting electrical wiring.
• Locate the signal, control and interface lines separately from the power supply
lines.
• Locate the analog and digital signal leads separately from each other.
• Carefully plan the arrangement of signal lines in the cables as well as the use of
connector box openings in the IP-54 system housing.
What materials are
needed?
• Selection of the required conductors depends on line length and planned
current load.
• Notes regarding conductor section for I/O module connection:
• The maximum capacity of terminals for stranded or solid conductors is 1 mm
2
(17 AWG).
• The stranded conductor may be tinned on the tip or twisted for simplified
connection.
• When using wire end ferrules the total section should not exceed 1 mm
2
,
i.e. the maximum stranded conductor section is 0.5 mm
2
. The Weidmüller
PZ 6/5 crimping tool must be used for crimping the ferrules.
• Maximum line length 1200 meters (3940 feet, transmission rate max. 19200 bit/s)
for RS485.
• Maximum line length 15 meters (50 feet) for RS232.
• The matching female connector housings for the connection strips on the I/O
modules are supplied with the device.
Connection Box The IP-54 version of the system housing has a connection box on the back of the
electronics module.
The connection box has:
• EN version: Five M20 and two M32 threaded cable connections
• CSA version: One 1-1/4-inch and two 3/4-inch conduits.
Two M32 threaded cable connections are provided to route system bus, Modbus,
Profibus and Ethernet cables.
Protective Cap A protective cap is factory-installed on the rear of the electronics module when the
Limas11 UV analyzer module is installed in the central unit.
It is imperative to re-install the protective cap after connection of the electrical
lines! Otherwise light penetration during operation may lead to erroneous measure-
ment values and measurement range overflows.
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