IAI America REXT - Manual (Page 291)


Part 2 Startup Chapter
Chapter 2 Mounting and Installation
267
Part 2 Startup Chapter
(3) Profibus-DP
For details on Profibus-DP, refer to the operation manual of the master (PLC) and also visit the website of the Japanese
Profibus Organization. The following explains the points to note regarding network wiring. A network connection example
is shown below
[1] A device connected to a network and to which an address is assigned is called a “Node.” A node may be the master or
a slave. Up to 32 nodes can be connected in one segment.
[2] It is recommended that the master be connected to one end of the network. Normally the node address of the master is
2 and each slave has a node address of 3 to 32.
Node address 0 is reserved for a monitoring or diagnostic device, while node address 1 is reserved for a monitoring
device.
[3] A terminal resistor must be installed at both ends of each segment of the network.
[4] For the Profibus cable, use a Profibus-DP cable of type A conforming to the EN 50170 standard. This cable is a
shielded 2-core twisted pair cable.
[5] The network connectors are D-sub, 9-pin connectors conforming to the EN 50170 standard.
As for network bus connectors, screw-type connectors like the one shown below and quick connectors where the
cables are inserted into provided holes are available.
Cable
Shield
Red Line B (positive side)
Green Line A (negative side)
When a connector with terminal resistor is used,
turn on the terminal resistor switch only for the
terminal slave and turn off the switches for all
other slaves.
(Node address 2) Master
Terminal resistor
Slave Slave Slave Slave
(Node address 3) (Node address 4) (Node address (5) (Node address (6)
Terminal resistor
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