Spectrum-controls 1794sc-IRT8I Manuel d'utilisateur télécharger pdf (Page 38)

3-12 Flex™ IO Isolated RTD/Thermocouple Module

User'sManualPub.0300242‐01Rev.A

3.4.5 Open Circuit Mode [Words 1 – 8 (Bits 12 & 13)]

The open circuit mode determines the fail-safe data value each channel is to default to in

the event of an open circuit condition. The table below lists the available options.

Table 3-7 (Open Circuit Mode)

Bit 13 Bit 12 Open Circuit Mode:

0 0 Zero analog value on broken input.

0 1 Set analog value to Max scale on broken input.

1 0 Set analog value to Min scale on broken input.

1 1 Previous Value

3.4.6 Disable CJC [Words 1 – 8 (Bit 14)]

This bit is used to disable CJC compensation for the associated channel.

Table 3-8 (Disable CJC)

State Function

0 CJCs Enabled

1 CJCs Disabled

This field is only used if the input type is a thermocouple and the

format is not a CJC format. No compensation is performed on the

thermocouple when disabled.

3.4.7 Temperature Units [Words 1 – 8 (Bit 15)]

This bit enables Celsius or Fahrenheit for the associated channel.

Note: If the associated channel is not configured for an RTD or

thermocouple, the temperature units have no effect.

Table 3-9 (Temperature Units)

State Function

0 Degrees C

1 Degrees F

3.4.8 Low Alarm Threshold [Words 9,12,15,18,21,24,27,30]

Low alarm threshold setting for channels 0 through 7, respectively.

Note: The data range is determined by the data format selected.

3.4.9 High Alarm Threshold [Words 10,13,16,19,22,25,28,31]

High alarm threshold setting for channels 0 through 7, respectively.

Note: The data range is determined by the data format selected.

3.4.10 User Alarm Deadband [Words 11,14,17,20,23,26,29,32]

The deadband is a range through which the measured input may be varied without

initiating and alarm response. The deadband setting must adhere to the following rules:

• The deadband must be greater or equal to zero.

• The deadband cannot exceed 25% of full scale.

• The alarm limits including deadband may not exceed the user range limits.

• The low alarm including deadband may not overlap the high alarm including

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Spectrum-controls 1794sc-IRT8I Manuel d'utilisateur Page 38