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5 PROCEDURES BEFORE SYSTEM OPERATION
5.5 Wiring
5.5.1 PROFIBUS cable wiring
•
For details on making Mitsubishi PLC conform to the EMC directive and low voltage instruction
when installing it in your product, please see Chapter 3,"EMC Directive and Low Voltage
Instruction" of the PLC CPU User's Manual (Hardware).
•
Please use the PROFIBUS cable with braided shield.
5.5.2 Terminator switch
5 - 10
This section explains the wiring to PROFIBUS connector for the QJ71PB92D
(1) Pin assignments for the connector
Pin No.
Symbol
Name
1
SHIELD
2
RP
3
B/B'
RxD/TxD-P
4
CNTR-P
5
C/C'
DGND
6
VP
7
RP
8
A/A'
RxD/TxD-N
9
CNTR-N *1
1 Signal is optional.
2 When the terminal resistance value of building into is made it is, signal is used.
Wiring is not needed.
(2) Wiring
QJ71PB92D
SHIELD
RxD/TxD-P
RxD/TxD-N
REMARK
(1) Whether or not to set the built-in module terminal resistance (1/2W 220
units) can be selected by connecting a switch. (The stations on both ends of the
PROFIBUS segment must be connected with terminal resistor.)
Silk display
BUS TERMINATION
Connects terminals resistor
(2) When the QJ71PB92D's bus termination switch is set to on (has terminal resistor),
do not remove the PROFIBUS cable from the QJ71PB92D during PROFIBUS-
DP network operation. If the cable is removed, then the terminal resistor in the
network will disappear, causing an error and bringing down the network.
Application
Shield, Protective Ground
1
Reserved for Power
Receive/Transmit Data-P
1
Control-P
Data Ground
2
Voltage-Plus
1
Reserved for Power
Receive/Transmit Data-N
Control-N
1
PROFIBUS cable
3
8
ON
Disconnects terminal resistor (setting at time of
shipment)
MELSEC-Q
x 2
OFF
5 - 10
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