Spectrum-controls 1769sc-IF8u Manuel d'utilisateur télécharger pdf (Page 52)

42 Compact IO

™

Universal Input module

Enabling 2/4 Wire RTD (Bit 15)

Setting bit 15 to a one enables 2/4 wire RTD on the associated channel.

Note: Bits 14 and 15 are used for RTD and resistance modes only. They

are used to specify 2, 3, or 4 wire RTD modes. 2-wire RTD mode is

implemented when cyclic lead compensation (bit14) is disabled and 2/4-

wire(bit15) is enabled 3-wire RTD and resistance is implemented by

enabling cyclic lead compensation and disabling 2/4 wire. 4-wire RTD or

resistance is implemented by enabling 2/4 wire and disabling cyclic lead

compensation.

Number of Wires Bit 15 Bit 14

210

301 or 0

410

Disabling Cyclic Lead Compensation (Bit 14)

Setting bit 14 to a one disables cyclic lead compensation.

Note: Bits 14 and 15 are used for RTD and resistance modes only. They

are used to specify 2, 3, or 4 wire RTD modes. 2-wire RTD mode is

implemented when cyclic lead compensation (bit14) is disabled and 2/4-

wire(bit15) is enabled 3-wire RTD and resistance is implemented by

enabling cyclic lead compensation and disabling 2/4 wire. 4-wire RTD or

resistance is implemented by enabling 2/4 wire and disabling cyclic lead

compensation.

Number of Wires Bit 15 Bit 14

210

301 or 0

410

Selecting Data Formats (Bits 13 through 11)

This selection configures channels 0 through 7 to present analog data in

any of the following formats:

Engineering Units x 1

Engineering Units x 10

Raw/Proportional Data

Scaled for PID

Percent Range

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 125 126

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Spectrum-controls 1769sc-IF8u Manuel d'utilisateur Page 52