2711-PK12C6A1 A-B Central Control Unit
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The MicroLogix 1000 Series D or later discrete and all MicroLogix 1000 analog controllers perform automatic protocol switching between DH–485 and the configured DF1 protocol. (The controller cannot automatically switch between DF1 full-duplex and DF1 half-duplex slave.) This feature allows you to switch from active communication on a DF1 half-duplex network to the DH–485 protocol to make program changes. Simply disconnect the MicroLogix controller from the DF1 half-duplex network and connect it to your personal computer. The controller recognizes the computer is attempting to communicate using the DH–485 protocol and automatically switches to it. When your program changes are complete, you can disconnect your computer, reconnect the modem, and the controller automatically switches back to the configured DF1 protocol. For example, if you are using the DH–485 protocol to make program changes and you connect an HHP, you can switch to active communication on a DF1 full-duplex network. The following baud rate limitations affect autoswitching: • If the configured DH–485 baud rate is 19200, the configured DF1 baud rate must be 4800 or greater. • If the configured DH–485 baud rate is 9600, the configured DF1 baud rate must be 2400 or greater.
This chapter explains how to program the MicroLogix 1000 programmable controller. Read this chapter for basic information about: • principles of machine control • understanding file organization and addressing • understanding how processor files are stored and accessed • applying ladder logic to your schematics • a model for developing your program
The structure and details of the product：
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