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37
Defining PROFIBUS-DP in the Software
Section 2-5
PROFIBUS Organization recommends the following rule for data line color
codes: PROFIBUS cables in general will use the colors red and green for the
data lines, with the following assignment:
Data cable wire A - green
Data cable wire B - red
This rule applies to both the incoming and the outgoing data lines.
2-4-4
Shielding Precautions
Cable shield connection
To ensure electro-magnetic compatibility (EMC), the shield of the cable should
be connected to the metal case of the plug connector.
If the Unit is installed in a control cabinet, the bus cable shield should be
brought into physical contact with a grounding rail using a grounding clamp or
similar device. The cable shield should continue in the cabinet right up to the
PROFIBUS device.
Ensure that the PLC and the control cabinet in which it is mounted have the
same ground potential by providing a large-area metallic contact to ground,
e.g. galvanized steel to ensure a good electrical connection. Grounding rails
should not be attached to painted surfaces.
For further information regarding PROFIBUS network installation, please refer
to “Installation Guideline for PROFIBUS-DP/FMS” (PNO Order No. 2.112),
which is available at every regional PROFIBUS Organization. The information
covers:
• Commissioning of PROFIBUS equipment.
• Testing the PROFIBUS cable and bus connectors.
• Determining loop resistance.
• Testing for correct bus termination.
• Determining the segment length and cable route.
• Other test methods.
• Example of an equipment report in the PROFIBUS guideline.
2-5
Defining PROFIBUS-DP in the Software
Defining the Configuration
After making the physical connections of the network, the configuration then
has to be defined in the software. OMRON provides a dedicated PC-based
configuration program, called CX-Profibus, as well as the required DTMs for
this purpose. It must be used to:
• Define the master(s).
• Assign slaves to their respective master(s).
• Assign slaves to groups for broadcast/multicast messages.
• Enter bus parameters, e.g. baud rate, target rotation time etc.
Downloading the
Configuration
The system must be downloaded to the master Unit after configuring it at the
PC. This is made possible by either connecting the serial COM port of the PC
to the CS1/CJ1 PLC with a serial interface cable, or use an ethernet connec-
tion between the PC and the CS1/CJ1 PLC via an ethernet unit.
Ground Rail
Outside cabinet
Inside cabinet
Summary of Contents for SYSMAC CJ1W-PRM21
Page 2: ...iv...
Page 36: ...22 Basic Operating Procedure Section 1 5...
Page 52: ...38 Defining PROFIBUS DP in the Software Section 2 5...
Page 112: ...98 Allocated CIO Area Words Section 4 2...
Page 122: ...108 Command Response Reference Section 5 2...
Page 160: ...146 Replacing the Unit Section 7 8...
Page 174: ...160 Appendix...
Page 180: ...166 I O Data Conversions Appendix D...
Page 186: ...172 Configurator Error and Warning Messages Appendix E...
Page 187: ...173 Index...
Page 188: ...174 Index...
Page 190: ...176 Revision History...