Rockwell-automation 1790-XXXX CompactBlock LDX I/O DeviceNet RTD and T Uživatelský manuál stáhnout pdf (Strana 11)

11

Publication 1790-IN011B-EN-P - April 2003

To ensure that the lead values match as closely as

possible:

• keep lead resistance as small as possible and less than

25 ohms

• use quality cable that has a small tolerance impedance

rating

• use a heavy-gauge lead wire which has less resistance

per foot

RTD Wiring Configurations

Three configurations of RTDs can be connected to the

blocks:

• 2-wire RTD, which is composed of an RTD EXC

(excitation) lead wire and a RTN (return) wire

• 3-wire RTD, which is composed of a Sense and 2 RTD

lead wires (RTD EXC and RTN)

• 4-wire RTD, which is composed of a Sense and 2 RTD

lead wires (RTD EXC and RTN). The second sense

wire of a 4-wire RTD is left open.

2-Wire RTD Configuration

CH0_A

CH0_B

COM

Add Jumper

Cable Shield (to Ground)

RTD EXC RTD EXC

Return Return

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 23 24

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