Chapter 1. Installation
16 DigitalFlow™ XMT868i Startup Guide
1.7.5e Wiring an RTD Inputs Option Card
The Model XMT868i RTD (Resistance Temperature Device) inputs option card provides two direct RTD inputs
(designated as A and B). Each RTD input requires three wires, and should be connected as shown on the label in the
rear cover (see Figure 3 on page 6 and Figure 11 on page 24).
1.7.5f Wiring a 0/4-20 mA Analog Outputs Option Card
The analog outputs option card includes two isolated 0/4-20 mA outputs (designated as A and B). Connections to these
outputs may be made with standard twisted-pair wiring, but the total current loop impedance for these circuits must not
exceed 1,000 ohms. Wire this option card with the connections shown on the label in the rear cover (see Figure 3 on
page 6 and Figure 11 on page 24).
1.7.5g A Specific Example
To illustrate the procedures described in the previous sections for wiring the option cards, a specific example may
prove helpful. Assume that an XMT868i is equipped with an option card numbered 703-1223-08. Table 22 on page 69
in Appendix B, Data Records, indicates that this option card includes two analog current inputs and two standard alarm
relays.
By referring to Figure 11 on page 24, you can see that the appropriate connection diagram for this option card is the
first one from the left in the middle row. This label is also be found inside the rear cover of the XMT868i. Based on this
information, wiring of the Input/Output connections to terminal block
J2 should be completed as shown in Tab le 3
below.
Table 3: Wiring a 703-1223-08 Option Card
J2 Pin # Description Connection
1 Alarm A Normally Open
2Alarm A Common
3 Alarm A Normally Closed
4 Alarm B Normally Open
5Alarm B Common
6 Alarm B Normally Closed
7 Out C +24 V to Input C
8 Input C Signal (+)
9 Input C Return (-)
10 Out D +24 V to Input D
11 Input D Signal (+)
12 Input D Return (-)
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