MU-431, MU-432, MU-436, MU-437
The MU-43x modules are designed for monitoring the state of digital signals (switches, etc.) and pulse counting. Additionally, the MU-436 and MU-437 offer a powerful computing unit for calculation immediate and total consumption (electricity meters, water flowmeters, etc.).
Digital inputs are designed for signals with TTL levels or passive contact (an internal "pull-up" resistor or external against +24V is considered) and are equipped with digital low-pass filters to suppress "ringing" on input signals.
Modules MU-431 and MU-432 include four 32-bit counters with value preset and start/stop capability by Modbus RTU command via RS-485.
Modules MU-436 and MU-437 include four 109 counters with value preset and start/stop capability by Modbus RTU command via RS-485. Additionally, they are also equipped with a powerful computing unit and set of counters/timers for calculating following values:
- immediate consumption; it is proportional to the signal frequency (can be configured using several parameters)
- total consumption; it is proportional to the counter value
- capturing counter and computing unit values by an external signal (e.g. quarter-hour maximum)
- capturing counter and computing unit values at a preset time (MU-432 and MU-437 modules only)
In case of a power-off, the counter and computing unit values are backed up in EEPROM (does not require a backup battery limiting temperature range). After power-on the counters and computing unit registers can optionally continue from either a backed up value or a zero value.
Additionally, the MU-432 and MU-437 modules are equipped with real-time clock circuit (abbreviation RTC) allowing e.g. to back up the power supply failure time. RTC circuit requires a battery and these types can not be supplied for extended temperature range.
Note: In applications where isolated inputs or eight counters are needed, modules MU-44x or MU-84x series can be recommended.
Specifications
| Type | MU-431 | MU-432 | MU-436 | MU-437 |
|---|---|---|---|---|
| Number of digital inputs | 4 | |||
| Type of digital inputs | TTL/12V without isolation, passive contact | |||
| Digital input signal (level L) |
0÷0,8VDC | |||
| Digital input signal (level H) |
2÷20VDC | |||
| Overvoltage protection | +35V/-10V (max. 1s) | |||
| Digital input impedance | cca 5kΩ (against +5V voltage) | |||
| Digital port isolation | without isolation | |||
| Number of counters | 4 | |||
| Counter frequency | 1kHz max. (asymmetry 40/60% max.) |
400Hz max. (asymmetry 40/60% max.) |
||
| Counter range | 0÷4294967295 (i.e. 232) | 0÷999999999 (i.e. 109) | ||
| Computing unit | - - - | - - - | yes | yes |
| Counter & computing unit values backup |
yes (EEPROM, battery-less) | |||
| Real-time clock (RTC) | - - - | yes | - - - | yes |
| Supply voltage | 10÷30VDC | |||
| Power consumption | 1.2W max. | |||
| Housing & Dimensions | Modulbox 3M | |||
| Signal terminals | screw terminals, wire 2.5mm2 max. | |||
