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4.2.2.
Wiring of Universal Interface Modules (PJK-100)
TB B A
24VDC
TB B A
PJK-102
PJK-120
PJK-111
24VDC
Module RS485
A B COM
K2: terminal resistor
ON
K2
Connection with shielded twisted pair cable, shielding is
grounded at one point, at the MultiCONT.
The terminal resistor is connected to the two farthest points
of the cable. (TB and B terminals are connected in PJK 100;
and on the MultiCONT the K2 terminal resistor, located
next to the terminals, is switched on.)
TB B A
24VDC
OFF
relay module
4-20 mA module
relay + 4-20 mA module
The most important rule is that the data transfer line has to be closed at both ends with a resistor, at points farthest from each other. The value of the terminal resistor
depends on the wave impedance of the connecting cable. The interface contains a 120
terminal resistor, so please use a cable with appropriate impedance.
A configuration, whereby there aren’t 2 terminal resistors, or where the 2 terminal resistors are not at the farthest points from each other is a bad configuration.
In such cases, especially if the data transfer cable is too long, data transfer errors are likely to occur.
The Universal Interface Modules should be connected one after another on one cable pair. Star-shaped topology is forbidden. The maximum length of the cable is
1000m, but in this case a cable with shielded, twisted pair of wires (
STP
,
S
hilded
T
wisted
P
air) must be used. The capacitance of the cable should be less than
100 pF/m. The Universal Interface Modules connected to a system must each be given different addresses (0…31), see 5.2.1.2.
Summary of Contents for MultiCONT
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