Phoenix Contact SCK-C-MODBUS User Manual page 47

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Please note the following recommendations for cabling.
Table 6-3 RS-485 cabling recommendations
RS-485
Cable
Shielding
Surge protection
Repeater
Table 6-4 SCK bus cabling recommendations
SCK bus
Cable
Shielding
Surge protection
Repeater
SCK-M-U-1500V
Table 6-5 Analog connection/power supply cabling recommendations
Analog connection/power supply
Cable
Shielding
Table 6-6 Voltage connection cabling recommendations
Voltage connection
Cable
2
0.25 mm , twisted pair, (double) shielding
Connect both ends of the outer shield to ground. Connect the
inner shield on the controller to ground and on the communi-
cation module to GND2 only.
For cables lengths > 10 m, install appropriate surge protection
for RS-485 data cables in the immediate vicinity of the SCK-
C-MODBUS and of the higher-level controller (see "Accesso-
ries" on page 110).
To decouple or improve signals in networks, e.g., to cover
large distances, a repeater can be inserted in the RS-485 net-
work. For example, use a PSI-REP-RS485W2 (Order No.
2313096) for this.
2
0.75 mm , twisted pair, single shielding
Connect both ends of the shielding to ground.
For cables lengths > 10 m, install appropriate surge protection
for 24 V DC systems in the immediate vicinity of the SCK-C-
MODBUS and of the connected Solarcheck measuring mod-
ule (see "Accessories" on page 110).
A repeater cannot be used in the SCK bus cable as it would
affect power supply to the connected measuring devices.
2
0.75 mm , twisted pair, single shielding, maximum length of
0.5 m
Connect both ends of the shielding to ground.
2
≥ 0.75 mm , double insulated (appropriate to system volt-
age), short-circuit-proof and ground-fault-proof installation
Installation
47
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