Measurement-computing CIO-DAS48-I User Manual download pdf (Page 14)

CIO-DAS48-I User's Guide Functional Details

Three-wire devices

Figure 9 shows a three-wire, 4 to 20 mA device connected to channel 0 of the CIO-DAS48-I. Three-wire

devices will typically specify the maximum load resistance for the current output. The input resistance of the

CIO-DAS48-Iis 100 Ω (determined by the CIO-DAS48-ISIP installed). Add this value to any other load

resistances in the loop. Typically, the maximum resistance specified for three-wire devices is on the order of

1 kΩ

CH 0 IN HI

CH 0 IN LO

100

3-wire,

4 - 20 mA

Device

CH 0

LLGND

CIO-DAS48-I

24V

Figure 9. Connecting a three-wire device

1 2 ... 9 10 11 12 13 14 15 16 17

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Measurement-computing CIO-DAS48-I User Manual Page 14