SPNIS21 ABB Analog Output Module Power Card Controller

Description

SPNIS21 The module automatically performs A/D calibration at powerup. Automatic calibration is then

repeated every minute to compensate for changes in the ambient temperature. New calibration

values are filtered into the current calibration values.

SPNIS21 The Thermocouple Input module uses the following data types:

8 words of analog input data.

8 words of analog output data. This data is written to the module by the Bus Interface Unit

(BIU). It contains the Reference Junction Compensation value, which is a 16-bit temperature

value in degrees C. Use of this data is optional; it is needed only when Remote Compensation

is configured for one or more channels on the module.

48 bits of discrete inputs for module and channel status data (use of this data is optional).

16 bits of discrete outputs for fault-clearing commands to the module (also optional).

The module exchanges data with a Bus Interface Unit in the same manner as other types of I/O

modules-it provides all its input data and status bits when requested by the BIU, and receives fault

clearing commands from the BIU via its assigned output bits. Note that the BIU can be configured

not to send status data over the network.

SPNIS21 The module can also be configured for “Group” data transfer with the BIU or with other intelligent

devices in the same Field Control station. Group data transfer, and the steps for configuring it, are

described in the Bus Interface Unit User’s Manual.

Compatibility

This module must be used with a Bus Interface Unit revision 2.0 or later.

Like other Field Control modules, the Thermocouple Input module is usually configured from the

Bus Interface Unit, using a compatible hand-held programmer. SPNIS21 The module will also accept

configuration data from the bus when used in a system that supports such configuration. The table

below summarizes configuration choices and defaults.

The module will power up with the default configuration settings. These defaults may be changed

as appropriate for the application. For configuration instructions, refer to the Bus Interface Unit

User’s Manual.

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