:: Products

MU-825, MU-826

The MU-825 and MU-826 modules are designed for monitoring the state of digital signals (switches, etc.) with industrial signal levels. Additionally, the digital inputs are equipped with counters.

The whole digital input group is isolated from other circuits of module (power supply and RS-485 interface), but inputs are not isolated from each other.

Note: In case of higher signal concentration, modules MU-32xxA series can be recommended.


Type MU-825 MU-826
Number of digital inputs 8
Type of digital inputs group isolated
bipolar 24V
group isolated
bipolar 24V

with 50Hz filter
Digital input signal
(level L)
<3VDC (both polarities) <3VDC (both polarities)
<3VRMS (signal 50Hz)
Digital input signal
(level H)
10÷35VDC (both polarities) 10÷35VDC (both polarities)
15÷35VRMS (signal 50Hz)
Overvoltage protection ±60VDC (max. 1s)
60VRMS (signal 50Hz, max. 1s)
Digital input impedance 14kΩ approx.
Digital input isolation 1kVDC (DIN block against other circuits)
(no isolation between DIN channels)
Number of counters 8
Counter frequency 200Hz max.
(signal asymmetry
40/60% max.)
10Hz max.
(signal asymmetry
40/60% max.)
Counter range 0÷4294967295 (i.e. 32-bit counter)
Supply voltage 10÷30VDC
Power consumption 1.2W max.
Housing & Dimensions Modulbox 3M
Signal terminals screw terminals, wire 2.5mm2 max.