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Description

SPAS011 The RTD Input Module accepts four inputs from three-wire or four-wire RTDs and converts the

input level to a digital value. Input spans support a variety of RTD types, as listed in the Module

Specifications section.

The analog/digital converter reads the voltage SPAS011 generated by each of the four inputs. The A/D

converter converts the differential measurement into a binary value (15 bits plus sign), which is

read by the block’s microprocessor. The microprocessor sets the gain required in the analog/digital

converter for each individual input. The gain is based on the RTD type that has been configured for

that input.

SPAS011 The microprocessor selects the input by means of a solid state, optically-coupled multiplexer. Three

measurements are made for each input: Excitation current, RTD resistance including field wire

drop, and field wire drop. From these three measurements, the module calculates the RTD

resistance. A DC/DC converter circuit isolates the field side from the logic circuits.

SPAS011 A starting reference and length in the Bus Interface Unit (BIU) data tables for each data type is

selected during module configuration. Depending on the configuration that has been set up for each

RTD, the input data can be reported as tenths of ohms, tenths of degrees Fahrenheit, or tenths of

degrees Celsius.

This module exchanges data with a BIU in the same manner as other types of I/O modules-it

provides all its input data and status bits when SPAS011 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.

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.

Like other Field Control modules, the RTD Input module is usually configured from the Bus Interface

Unit, using a compatible hand-held programmer. 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.

For configuration instructions, refer to the Bus Interface Unit User’s Manual.

SPAS011 Each channel can be configured as either active or inactive.

If a channel is inactive, it is not scanned and a value of 0 is returned to the BIU.

If a channel is active, and the configured analog input data length is not long enough to

accommodate the data for a particular channel, the data for that channel is still processed, since the

response to a group command may be used to transmit that channel’s data to the BIU.

Low Alarm Limit and High Alarm Limit

Each input channel can have a low alarm limit SPAS011 and a high alarm limit. If an input reaches one of its

limits, the module reports the actual value and sends the appropriate diagnostic bit in the discrete

input table of the BIU. Alarms do not stop the process or change the value of the input.

Alarm limits can be set anywhere over the dynamic range of the signal. The range for each is

-32,768 to +32,767. The high alarm limit must be greater than the low alarm limit. If alarm

reporting is not wanted, alarm limits can be set beyond the dynamic range of the signal so they will

never be activated.

Input Selection to Include RTD Type

Each input channel can have a different RTD type, selectable from a list of many different RTDs.

If the actual RTD resistance does not match the defined type, an adjustment factor can be

configured in tenths of ohms.

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