Allen-Bradley MicroLogix 1200 - Isolated Modem Connection

Publication 1762-UM001D-EN-P - March 2004
4-6 Communication Connections
We recommend using an AIC+, catalog number 1761-NET-AIC, as
your optical isolator. See page 4-14 for specific AIC+ cabling
information.
Isolated Modem Connection
Using an AIC+ to isolate the modem is illustrated below.
(1) Series C or higher cables are required.
For additional information on connections using the AIC+, refer to the
Advanced Interface Converter (AIC+) User Manual, publication
1761-6.4.
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
Modem Cable
(straight-through)
Personal Computer
Modem
Optical Isolator
(recommended)
Modem
MicroLogix 1200
Channel 0
Protocol Options
• DF1 Full-Duplex protocol (to 1 controller)
• DF1 Half-Duplex protocol (to multiple controllers)
• Modbus RTU Slave protocol
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
1761-CBL-AM00 or 1761-CBL-HM02
(1)
User-supplied modem cable
Modem
MicroLogix 1200
Channel 0
24V dc
MicroLogix 1200 provides power to the AIC+ or an external power
supply may be used. See Appendix F, System Loading and Heat
Dissipation.