Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
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Appendix E Connect to Networks via RS-232/RS-485 Interface
Modbus Communication
Protocol
Modbus is a Half-Duplex, master-slave communications protocol. The Modbus
network master reads and writes coils and registers. Modbus protocol allows a
single master to communicate with a maximum of 247 slave devices.
MicroLogix 1400 controllers support Modbus RTU Master and Modbus RTU
Slave protocol.
For more information on configuring your MicroLogix 1400 controller for
Modbus protocol, see MicroLogix 1400 Programmable Controllers Instruction
Set Reference Manual, publication
. For more information about
the Modbus protocol, see the Modbus Protocol Specifications (available from
).
ASCII
ASCII provides connection to other ASCII devices, such as bar code readers,
weigh scales, serial printers, and other intelligent devices.
You can use ASCII by configuring the RS-232/RS-485 port, channel 0 and the RS-
232 port, Channel 2 for the ASCII driver. For detailed configuration
information, see MicroLogix 1400 Programmable Controllers Instruction Set
Reference Manual, publication
.
Distributed Network
Protocol (DNP3)
For more information on configuring your MicroLogix 1400 controller for
Distributed Network Protocol, see
Channel Configuration for DNP3 Slave on
. For more information about Distributed Network Protocol, see the
Distributed Network Protocol Specifications, available from
.
Disable Serial Channels 0 and 2
In RSLogix 500 software, you can disable Serial Channels 0 and/or 2 to
enhance security.
1. Open the Channel Configuration in the MicroLogix 1400 project tree and
select a channel.
2. From the Driver drop-down list, select Shutdown.
3. Click Apply and OK.
The selected serial channels are disabled.
IMPORTANT
At least 1 of the 3 channels must be active to enable communication with
the RSLogix 500 software. You cannot disable the last serial channel if the
other 2 channels (Serial, Ethernet) are already configured as disabled.
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Страница 18: ...18 Rockwell Automation Publication 1766 UM001O EN P September 2021 Chapter 1 Hardware Overview Notes ...
Страница 56: ...56 Rockwell Automation Publication 1766 UM001O EN P September 2021 Chapter 3 Wire Your Controller Notes ...
Страница 122: ...122 Rockwell Automation Publication 1766 UM001O EN P September 2021 Chapter 5 LCD and Keypad Notes ...
Страница 152: ...152 Rockwell Automation Publication 1766 UM001O EN P September 2021 Appendix B Replacement Parts Notes ...
Страница 160: ...160 Rockwell Automation Publication 1766 UM001O EN P September 2021 Appendix C Troubleshoot Your System Notes ...
Страница 302: ...302 Rockwell Automation Publication 1766 UM001O EN P September 2021 Glossary Notes ...
Страница 308: ...308 Rockwell Automation Publication 1766 UM001O EN P September 2021 Index Notes ...