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Chapter 4 – Electrical Installation
Modbus Plus Connectors
Modbus Plus Connector
Installation Tool
Modbus Plus Cable Imped-
ance Termination
Modbus Plus Network
Earthing
4-6
Two types of connectors are available from Modicon for connecting devices
to the network:
• Each in-line drop requires a line connector, Modicon part number AS-
MBKT-085. This part number contains one connector.
• The drops at the two ends of the cable each require a terminating connec-
tor, Modicon part number AS-MBKT-185. This part number contains two
connectors.
You should plan to order a sufficient quantity of connectors to allow extra
ones for service access and spares.
A special tool is available from Modicon for installing connectors on the net-
work cable. Use of the tool will ensure positive electrical contact between the
connector and cable, as well as make for a more rapid installation. Its use is
highly recommended. Its part number is:
AS-MBPL-001
When the terminating connectors are installed on the two extreme ends of the
cable, they furnish the proper terminating impedance for the network. The
cable termination is maintained regardless of whether a node device is con-
nected to either end of the cable. No other termination is required.
It is not necessary to provide an external matching termination to any connec-
tor. Any connector can be disconnected from its device without affecting the
network impedance.
The entire network cable, including its shield, should remain isolated from
external earth sources. No connection should be made between the cable and
the plant earthing system or the panel earthing connection at any point.
Earthing systems should connect to each device's dedicated earth terminal, not
to the network cable. The cable earth will be supplied by its network cable
connection to the device.
The cable shield earth is connected to terminal X1:3 (see Figure 4-2, page 4-
3) on the power connector on the NMBP-01 Module.
Modbus Plus Connector Assembly Tool
Installation and Start-up Guide for NMBP-01
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