Diagram of ABB DCS800 power board SDCS-PIN-4-COAT

Description

SDCS-PIN-4-COAT For 3-wire and 4-wire transmitters, an I/O Terminal Block with box terminals and Auxiliary I/O

Terminal Block can be used without any additional terminal strip. An additional terminal strip is

needed for an I/O Terminal Block with barrier terminals and an Auxiliary Terminal Block.

The +24V Out terminals are a common fused SDCS-PIN-4-COAT output from DC+ to drive loop-powered 2 wire

sensors. For anything other than 2-wire transmitters, jumper the Auxiliary Terminal Block to DC-.

SDCS-PIN-4-COAT The 16 Point Grouped Analog Input Module (IC670ALG240) accommodates 16 current loop

inputs on a common power supply. It accepts inputs from two-wire or three-wire current

transmitters and converts input levels to digital values.

The module stores the most recent 16 samples for each channel in a buffer. The outputs of the

buffer amplifiers are sequentially connected by an analog multiplexer to a 16-bit A/D converter. All

channels are converted approximately once every millisecond.. The input span of the A/D is fixed,

presenting binary values of 0 to 65535 for 0 to 25 milliAmps, with one LSB = 0.38 microAmps.

Samples are filtered according to the configured software filter. After filtering is performed, the

module adjusts data using scaling and offset constants. SDCS-PIN-4-COATThese are pre-calculated for each channel

from the calibration data, selected range, and specified engineering units.

The module checks scaled data against configurable alarm limits and against predefined values for

overrange, underrange, and broken wire conditions. If one of the following error conditions occurs

on a channel, the module sets a corresponding diagnostic bit (flag) in its configured discrete input

(%I) data, which can be monitored by the application logic. These faults are latched and can be

reset by sending appropriate fault-clearing (%Q) data to the module.

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High Alarm/Low Alarm: These diagnostics indicate that a scaled analog value is greater than

its high alarm or less than its low alarm limit. Each channel can have a High Alarm and Low

Alarm limit.

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Open Wire: This diagnostic indicates that a channel which has a low span value for scaling

that is greater than 2mA, and its actual input current is less than approximately 2mA.

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Overrange/Underrange Alarm: SDCS-PIN-4-COAT Indicates input value has reached A/D converter limits.

All analog user side connections are isolated from the Field Control backplane.

Host Interface

The 16 Point Grouped Analog Input module uses the following types of data:

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16 analog inputs (16 words)

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

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16 bits of discrete output data 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.

Compatibility

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

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