MicroLogix 1500 System

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System Overview

Communication

The MicroLogix 1500 controllers provide an RS-232C port. This port can be used for the following types of communication.

Communication	Description
Point-to-point communication	• Supports direct connection of programming and operator interface devices, and supports dial-in remote programming.
DF1 protocol	• DF1 full-duplex, DF1 half-duplex master and slave, report-by-exception, and peer-to-peer data exchange.
DF1 radio modem protocol	• Transmit data efficiently through the DF1 radio modem protocol. • Each read/write transaction requires only one TX from initiator and one TX from the responder, so “key-ups” and power consumption are minimized. • For more information see the MicroLogix 1200 and 1500 Instruction Set Reference Manual, publication 1762-RM001.
ASCII	• A full ASCII command set for the RS-232-C port allows read and write with ASCII devices.
Modbus RTU master and slave protocol	• Modbus communication is supported through the RS-232-C port. • Use a MicroLogix 1500 system as a smart RTU slave in an existing SCADA network.
DH-485 communication	• Connect to a DH-485 network through an Advanced Interface Converter (1761-NET-AIC). • The DH-485 network may connect up to 32 devices. • The communication port provides for program upload and download.
DeviceNet communication	• Connect to a DeviceNet network of up to 64 devices through a DeviceNet Interface (1761-NET-DNI). • The DeviceNet Interface provides slave I/O, peer-to-peer, COS (change-of-state), and program upload/download capability. • The MicroLogix 1500 processor supports backplane messaging, which allows the processor to read or write data to other devices on DeviceNet. • You can also use the 1769-SDN Device Net Scanner for DeviceNet master capabilities including messaging, program upload/download and monitoring.
EtherNet/IP communication	• Connect to an EtherNet/IP network through an EtherNet/IP-to-RS-232-C interface (1761-NET-ENI, 1761-NET-ENIW). • This module supports program monitoring and upload/download, data collection, and controller peer-to-peer communication. • It can also send e-mail messages via SMTP and display status and configuration information through a built-in Internet server.