Modbus Connection And Control; Connection To The Modbus Network; Network; Modbus Address Selection - Ingersoll Rand R30 Information De Produit

93014.15.06


Connection to the Modbus Network

The Xe-70M controller is designed to interface to any Modbus RTU master
capable device using Belden 9841 or equivalent RS-485 cable. In order to
connect to the network, the cable must be connected to port X04 on the
controller as shown in the fi gure below:
L2
L 1

RS-485 Network
RS-485 data communications and other low voltage signals can be
subject to electrical interference.
This potential can result in intermittent malfunction or anomaly that is
diffi cult to diagnose. To avoid this possibility always use earth shielded
cables, securely bonded to a known good earth at one end. In addition, give
careful consideration to cable routing during installation.
1. Never route an RS-485 data communications or low voltage signal
cable alongside a high voltage 3- phase power supply cable. If it is
necessary to cross the path of a power supply cable(s), always cross at
a right angle.
2. If it is necessary to follow the route of power supply cables for a
short distance (for example: from a compressor unit to a wall along a
suspended cable tray) attach the RS-485 or signal cable on the outside
of an earthed cable tray such that the cable tray forms an earthed
electrical interference shield.
3. Where possible, never route an RS-485 or signal cable near
to equipment or devices that may be a source of electrical
interference (for example: 3-phase power supply transformer, high
voltage switchgear unit, frequency inverter drive module, radio
communications antenna).
80447162 Rev B

MODBUS CONNECTION AND CONTROL

Figure 126
X e7 0M P h o e n ix 2 P in
C o n n e cto r
2
1
2 1
X 04
L2
L1
Figure 127
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Modbus Address Selection

Each compressor connected to the MODBUS network will have a unique
assigned address, starting at compressor 1 increasing sequentially to the
number of compressors connected to the MODBUS network.
The Modbus address for each compressor is set on the General Settings Tab,
Page 4. The controller's default Modbus Address setting is 1,
Additionally, the active protocol must be set to Modbus Slave.
Figure 128


Modbus Master Settings

In order to communicate properly with the Xe-70M controller, the Modbus
master must be set to communicate with the following confi guration:
Baud Rate – 9600
Data Bits – 8
Stop Bits – 1
Parity – None
The following polling parameters are recommended for optimal system
operation:
Polling Rate: Not less than 500 ms
Timeout: 500 ms
Retries: 2
EN
EN-55