ABB 81EU01-E/R3210 Analog Signal Input Module

ABB 81EU01-E/R3210 Analog Signal Input Module

Module Overview

Application scenario: As an alternative to multiple input modules, it is suitable for 2-wire transmitters (4... 20mA, module power supply), 4-wire transmitters (0/4... 20mA, module or external power supply), and can replace 81EA01-E/R1010 (without calibration function), 81EA01-E/R1111 (with calibration function, no raw value output), and 81EA01-E/R1112 (with calibration function, raw value output).

Core functions: Includes 5 functional units, each unit can flexibly configure input modes, supports parameter programming (stored in EEPROM, not lost during power failure); Each analog signal can be assigned up to 4 limit values and supports 5 independent correction or filtering calculations (implemented through functional blocks).

Main characteristics

Interface and Communication: Equipped with PROCONTOL station bus standard interface, signals are transmitted in the form of telegrams. Before sending, a test flag is verified and marked, and when receiving, transmission integrity is also verified based on the test flag.

Anti interference design: It can eliminate interference between functional units and station buses, and each functional unit is equipped with a short-circuit protection and monitoring transmitter power supply.

Status indication: The ST (universal interference) indicator light on the front panel can display the response of internal monitoring circuits or input signal monitoring.

Signal processing and monitoring

Analog signal input and conversion

The input current signal is converted into a measurement voltage on a high-precision measuring resistor, connected to the input instrument amplifier through a multiplexer, and then converted into a 12 bit digital analog signal through an A/D converter.

The input instrumentation amplifier and A/D converter are monitored through reference voltage, while the analog signal is monitored through flatness (default upper limit of 118.75%, lower limit of -6.25%, can be modified in the configuration list). If exceeded, a response is triggered.

Fault handling

If the input is overloaded due to a circuit fault, the relevant functional unit will immediately shut down, and a "Process channel fault" message will appear in the diagnostic register. The interference bit in the data telegram will be set, and every 30 seconds, an attempt will be made to reactivate the unit.

When receiving bus telegrams, periodic updates will be monitored. If the signal has not been updated for a long time (such as a sending module failure), the receiving monitoring function will set the interference bit in the corresponding register, continue to use the last received value to calculate and forward the result with the interference bit.

Correction and filtering functions

Function block support: Provides flow measurement correction (KOR1 for water/steam, KOR3 for variable reference pressure gas), liquid level measurement correction (NIV), nonlinear filtering (FIL), each functional unit can use one function block, and KOR1, KOR3, and NIV include FIL function.

Restrictions: Maximum of 5 functional blocks, maximum of 20 bus signals, and maximum of 1 functional block per functional unit; When using functional blocks, the module cycle time will increase the calculation time of the corresponding functional block.

Limit signals and events

Limit setting: Each functional unit can program up to 4 limit values, and each limit value can choose 4 hysteresis values (HY1=0.39%, HY2=1.56% default HY3=3.12%、HY4=6.25%）， The limit range is -150% of the set signal range ...+150%.

Event trigger: When exceeding the limit, monitoring function response, analog value change exceeds the adjustable threshold (0.2%... 6.8%, default 1.56%) and exceeds the adjustable time (40ms, 200ms default), a limit signal telegram will be immediately sent to the station bus.

Diagnosis and status indication

Local indication: The front-end ST indicator light displays all interference and data communication interference of the module.

Diagnostic register: Register 246 stores fault types, including parameter faults, process channel faults, checksum errors, fault handling, etc., which can be sent to the alarm system or control diagnostic system (CDS) through the bus.

Fault cause: Process channel faults may be caused by unreliable analog signals, internal reference value interference, transmitter monitoring response, etc; Handling faults may be caused by invalid configuration lists, internal voltage interference, hardware defects, etc.