20B-STD  A-B  Control Unit

To wire the controller for high-speed counter applications use input terminals I/0, I/1, I/2, and I/3. Refer to chapter 12 for information on using the high-speed counter. Shielded cable is required for high-speed input signals 0-3 when the filter setting is set to either 0.10 ms or 0.075 ms. We recommend Belden #9503 or equivalent for lengths up to 305 m (1000 ft). Shields should be grounded only at the signal source end of the cable. Ground the shield to the case of the signal source, so energy coupled to the shield will not be delivered to signal source’s electronics. This chapter describes how to wire your controller system. The method you use and cabling required to connect your controller depends on what type of system you are employing. This chapter also describes how the controller establishes communication with the appropriate network.There are two ways to connect the MicroLogix 1000 programmable controller to your personal computer using the DF1 protocol: using an isolated point-to-point connection, or using a modem. Descriptions of these methods follow. You can also use modems to connect a personal computer to one MicroLogix 1000 controller (using DF1 full-duplex protocol) or to multiple controllers (using DF1 halfduplex protocol), as shown in the illustration that follows. Do not attempt to use DH– 485 protocol through modems under any circumstance. (For information on types of modems you can use with the micro controllers, see page D-9.)

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