ABB 07AI91 WT91 GJR5251600R4202 Analog Input Module 30-Day Returns！

Frequently Asked Questions (FAQ)

What types of signals can the ABB 07AI91 WT91 module handle?
The module supports a variety of input types including voltage signals (±10 V, ±5 V, ±500 mV, ±50 mV), current signals (0…20 mA, 4…20 mA with a 250 Ω shunt), Pt100/Pt1000 RTDs, and thermocouples of types J, K, and S.

Can I connect Pt100 and Pt1000 sensors simultaneously?
Yes, Pt100 and Pt1000 sensors can be operated simultaneously by assigning one type to the upper terminal bank and the other type to the lower terminal bank.

What is the resolution of the analog input values?
The input resolution is 12-bit plus sign, which ensures high accuracy for analog signal acquisition.

How is error detection performed in this module?
The module includes built-in diagnostics for open circuit detection, out-of-range signals, internal errors, and transmission errors. Errors are indicated via the red LED and communicated to the central unit.

What is required to measure current signals such as 4…20 mA?
An external 250 Ω shunt resistor is required between input terminals to measure 4…20 mA or 0…20 mA signals using voltage input ranges.

What kind of electrical isolation is implemented?
The CS31 system bus is electrically isolated from the analog input section, ensuring signal integrity and protection.

What happens if a thermocouple wire breaks?
A wire break results in the numerical value -32767 being displayed and an error message is generated and transmitted over the CS31 system bus.

What should be done with unused input channels?
Unused channels must be short-circuited. For Pt100 and Pt1000 channels, it is recommended to bridge them with 120 Ω and 1200 Ω resistors respectively to avoid underflow error messages.