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Entry type: Product note Entry ID: 109739595, Entry date: 08/29/2016

Delivery release - SM 1238 Energy Meter 480VAC for S7-1200

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The S7-1200 product portfolio has been extended by an additional Signal module to measure energy data. The new SM1238 Energy Meter 480VAC is now available for delivery.

The SM 1238 Energy Meter 480VAC is an additional signal module type and records over 200 different electrical measurement and energy values. It lets you create transparency about the energy requirements of
individual components of a production plant down to the machine level.

SM 1238 Energy Meter 480VAC


  • Measurement of electrical variables from single-phase, two-phase and three-phase AC power supply networks
  • Maximum nominal voltage between two outer conductors 480 VAC (max. phase voltage 277 VAC)
  • Recording of:Voltages
    • Currents
    • Phase angles
    • Power
    • Energy / electrical work
    • Frequencies
    • Minimum and maximum values
    • Power factors
    • Operating hours
    • Energy usage counter
  • The module supports the following functions:
    • Firmware update
    • I&M identification data
    • Reconfiguration in RUN
    • Diagnostics interrupts

Ordering information and technical specification:

 SM 1238 Energy Meter 480VAC 
 Article no. 6ES7238-5XA32-0XB0
 Current measurement Via current transformer 1 A, 5 A
 Voltage measurement up to 480 V AC direct connection
 > 480 V AC via voltage transformer
 Connection type

3P4W1     - Three-phase measurement, 4 wires

2P3W       - Two-phase measurement, 3 wires
1P2W       - Single-phase measurement, 2 wires
3 x 1P2W - 3 x single-phase measurement

 Network topologiesTN and TT network
 Number of measured valuesover 200
 Measuring access method
 (Module variants)

Read acyclically via data record
read cyclically for 19 defined data sets 


E0, E1, E2 and E3

 Measuring cycle, update timeTyp. 50 ms

Accuracy class (IEC 61557-12)

  • Measured variable voltage, current
  • Measured variable apparent power, active power
  • Measured variable reactive power
  • Measured variable power factor
  • Measured variable active energy
  • Measured variable reactive energy
  • Measured variable neutral conductor current
  • Measured variable phase angle
  • Measured variable frequency

  • 0.2
  • 0.5
  • 1
  • 0.5
  • 0.5
  • 1
  • 0.5; calculated
  • +/-1 °; not recorded by IEC 61557-12
  • 0.05
Engineering withTIA Portal V13 SP1 with Update 8 and HSP0151 or higher
CPU firmware version V4.1 or higher
 Ambient temperature during operationhorizontal installation: -20 .....60 °C
vertical installation:     -20 .....50 °C
 Dimensions  Width:    45 mm
Height: 100 mm
Depth:    75 mm

 Device manual "SIMATIC S7-1200 SM 1238 Energy Meter 480VAC": SIOS entry 109483435 

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