1 Device overview
1.3 Features
NZM-XMC Measuring and Communication Module
11/16 MN01219001Z-EN
www.eaton.com
7
1.3 Features
Table 2: Comparison between some of the characteristics of the NZM…-XMC-…
basic devices and the NZM-XMC-TC-MB universal device
Feature
NZM…-XMC-…
NZM-XMC-TC-MB
Supply voltage
24 V DC
230 V AC
Current transformer
integrated
external
Voltage indication ledge
With set screw
With connection or
voltage transformer
Number of digital inputs
2
–
Number of digital outputs
2 + 2 S0 pulse outputs
2 (alarm or SO pulse)
Harmonic
–
THD (V + I)
Per-phase energy values
yes
no
￫
S0 interface
The S0 interface is a hardware interface for transferring
electrical measured values. It is defined in the DIN 43 864
standard.
The data is transferred by means of weighted pulses
(pulses per kWh); the weighting depends on the type of meter.
Ensure correct polarity when connecting the interface, since the
output is implemented as a transistor or optocoupler.
A maximum voltage of 27 V DC can be connected.
The maximum power flow is approx. 30 mA.
The signal is generated by the meter as a current pulse.
A power flow less than 3 mA corresponds to a Low value.
A larger power flow is interpreted as a High value.
Note:
The S0 interface described above must not be confused with
the S0 bus within an ISDN installation!
