Thursday, March 31, 2011

Communication Choices of MicroLogix 1500 Programmable Controllers

All MicroLogix 1500 programmable controllers provide some communication options to fit into a variety of applications. The second full-function RS-232 communications port addition is enable two communication devices to be connected to the controller simultaneously such as ASCII device, operator interface device, modem or programming device.

The DF1 Full-Duplex protocol allows the MicroLogix 1500 to communicate directly with another device, such as a personal computer or an operator interface device. The protocol of DF1 Full-Duplex (also referred to as DF1 point-to-point protocol) is useful where the RS-232 point-to-point communication is required. The multi-drop of DH485 communication capability allows you to network up to the 32 MicroLogix or SLC 500 Controllers, Human Machine Interface (HMI) devices and/or the personal computers using peer-to-peer messaging.

And, the MicroLogix 1500 can communicate on a DeviceNet network as well. DeviceNet digitally links push buttons, sensors, actuators, PLCs and other industrial devices on an open network. MicroLogix 1500 controllers also support the DF1 Half-Duplex Slave communications for use in SCADA systems as a Remote Terminal Unit (RTU). This open network protocol is enable MicroLogix controllers to communicate as responder (slave) nodes on DF1 master/slave networks. DF1 supports up to 254 responder devices with a single master. Additionally, the MicroLogix 1500 supports the Modbus Slave, a SCADA/RTU protocol.

• One RS-232 port (available on all base units)
• Additional RS-232 port
• 300, 600, 1200, 4800, 9600, 19,200, and 38,400 baud rates
• RTS/CTS Hardware handshake signals – the channel 0
• RTS/CTS/DCD Hardware handshake signals – the channel 1
• Connection to DH485 and DeviceNet networks through the 1761-NET-AIC and 1761-NET-DNI, respectively
• Connection to the modems for remote communications
• ASCII messaging provides dial-out capability
The MicroLogix 1500 allows you to choose the network that best meets your needs.


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