Yes, these two input modules look pretty similar at first glance. Both of them feature 8 universal inputs for various analog signals, i.e., from current or voltage transmitters, temperature sensors, and other devices with standard analog outputs. Each input of the MV110-24.8A(AS) can be configured for the required signal, which allows communication to a range of different sensors or transmitters with one single module without the need to purchase several modules that usually come individually for each signal type. This feature makes these modules a powerful and cost-effective tool in automation systems.

Despite many features in common, the MV110-24.8A and MV110-24.8AS extension modules have some differences. The main of them are:

  • - Support for temperature sensors. The 8A supports a wide range of RTDs and TCs, and the 8AS does not support for temperature sensors of any kind.
  • - Different sampling time for each input. Comparing the standard current and voltage inputs of the MV110-24.8A and MV110-24.8AS extension modules, the difference in terms of sampling time per input is significant. It takes 5ms for the 8AS’s input to obtain one sample of the signal when the 8A needs 0.6 s (600 ms) to do the same.
  • - Support for digital signals. The 8A can be configured for digital signals, and the 8AS cannot be adapted to that use. That is why the MV110-24.8A Input Module is especially valuable if the system, besides analog signals, involves several digital signals as well, and it seems economically-unreasonable to purchase an additional digital module.
  • - Support for resistive position sensors. The 8A can operate with position sensors of 900 ohm or 2 kohm, and the 8AS cannot work with any resistive sensors.
  • - Support for different types of voltage signals. The 8A can process signals of 0-1 V or -50…+50 mV, and the 8AS does 0-10 V only.
MV110-24.8A MV110-24.8AS
General
Power supply 24 V DC
Power consumption, max. 6 W
Analog inputs 8* 8
Input signal RTD (see
User Guide for the complete list)
—//—
TC
(see User Guide for the complete list)
—//—
0(4)-20 mA
(sampling time per input 0.6 s)
0(4)-20 mA
(sampling time per input 5±2 ms)
0-5 mA
(sampling time per input 0.6 s)
0-5 mA
(sampling time per input 5±2 ms)
0-10 V
(sampling time per input 0.6 s)
0-10 V
(sampling time per input 5±2 ms)
0-1 V
(sampling time per input 0.6 s)
—//—
-50...+50 mV —//—
25...900 ohm —//—
25...2000 ohm —//—
Resolution 16 bit 10 bit
Communication
Interface RS485
Protocol Modbus RTU / ASCII
Baud rate 2.4...115.2 kBit/s
Environment
Ambient temperature -20...+55 °C
Storage temperature -25...+55 °C
Humidity up to 80%, non-condensing
IP Code IP20
Enclosure
Dimensions 63 x 110 x 75 mm
Weight approx. 240 g
Material plastic

*can be configured for digital signals

Making the choice

If you need to process only standard current signals of 4-20 mA, 0-20 mA, 0-5 mA, or voltage signal of 0-10 V, it is better to give your preference to the MV110-24.8AS input module taking advantage in sampling time of its inputs.

In other cases, such as the need for processing signals from RTD or TC temperature sensors, need for a combination of digital and analog inputs in one module, need for processing the 0-1 V or -50…+50 mV signals, you have no choice but the MV110-24.8A.