Intelligent Real-Time Controllers Operating Instructions and Specifications

Figure 27 shows how to wire several FP-1001 banks in an RS-485 network

controlled by the cFP-2220. Only two FP-1001 banks are shown, but the

cFP-2220 can control up to 24 FP-1001 banks. Install 120 Ω termination

resistors at each end of the network as shown in Figure 27.

Figure 27. Wiring for an RS-485 Network Controlled by the cFP-2220

COM 4 is designed to operate in four-wire mode as shown in Figure 27.

You can use COM 4 in two-wire mode, but you must design your

application so that it filters out the writes that echo back over the read

channels. NI does not recommend this method.

NI offers a DIN rail–mountable screw terminal adapter that you can use

to connect termination resistors to COM 4. The adapter is part number

778674-01.

Cable adapters for the 10-position modular jacks are available from NI.

Part numbers 182845-01, -02, and -03 are 1, 2, and 3 m cable adapters for

connecting the 10-position modular jack to a 9-position D-SUB plug.

External Digital Inputs and Outputs (cFP 2220 Only)

The cFP-2220 has two digital inputs and two digital outputs that you can

use to connect a simple operator interface to the controller. Refer to

Figure 1 for the location of the input and output terminals. The inputs and

outputs appear in software as Input 1, Input 2, Output 1, and Output 2.

Logic high for the DIO ports is +5 V. Logic low is 0 V. The DIO ports are

not isolated and are not intended for field connections. Use them only for

simple VI controls and indicators.

RXD– RXD+ TXD– TXD+

RX–

RX+ TX– TX+ RX– RX+ TX– TX+

cFP-2220 COM 4 FP-1001 FP-1001

120 Ω 120 Ω120 Ω120 Ω