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SIMATIC S7-1200, Analog input, SM 1238 Energy Meter 480 V AC, power measurement module for data acquisition in 1- and 3-phase supply systems (TN, TT) up to 480 V AC; Current range: 1 A, ***; acquisition of voltage, current, phase angles, power, energy values, frequencies; Channel diagnostics |
General information |
Product type designation |
SM 1238, AI energy meter 480 V AC |
HW functional status |
From FS02 |
Firmware version |
V2.0.1 |
Product function |
● Voltage measurement |
Yes |
— with voltage transformer |
Yes |
● Current measurement |
Yes |
— without current transformer |
No |
— with current transformer |
Yes |
● Energy measurement |
Yes |
● Frequency measurement |
Yes |
● Power measurement |
Yes |
● Active power measurement |
Yes |
● Reactive power measurement |
Yes |
● I&M data |
Yes; I&M 0 |
● Isochronous mode |
No |
Engineering with |
● STEP 7 TIA Portal configurable/integrated from version |
V13 SP1 |
Operating mode |
● cyclic measurement |
Yes |
● acyclic measurement |
Yes |
● Acyclic measured value access |
Yes |
● Fixed measured value sets |
Yes |
● Freely definable measured value sets |
No |
CiR - Configuration in RUN |
Reparameterization possible in RUN |
Yes |
Calibration possible in RUN |
Yes |
Installation type/mounting |
Mounting position |
Horizontal, vertical |
Supply voltage |
Design of the power supply |
from CPU |
Type of supply voltage |
DC |
Input current |
Current consumption, max. |
180 mA |
Power loss |
Power loss, typ. |
0.75 W |
Address area |
Address space per module |
● Address space per module, max. |
124 byte; 112 byte input / 12 byte output |
Time of day |
Operating hours counter |
● present |
Yes |
Analog inputs |
Cycle time (all channels), typ. |
50 ms; Time for consistent updat of all measured and calculated values (cyclic und acyclic data) |
Interrupts/diagnostics/status information |
Alarms |
● Diagnostic alarm |
Yes |
● Limit value alarm |
Yes |
● Hardware interrupt |
No |
Diagnostics indication LED |
● Monitoring of the supply voltage (PWR-LED) |
Yes |
● Channel status display |
Yes; green LED |
● for channel diagnostics |
Yes; red Fn LED |
● for module diagnostics |
Yes; green/red DIAG LED |
Integrated Functions |
Measuring functions |
● Measuring procedure for voltage measurement |
TRMS |
● Measuring procedure for current measurement |
TRMS |
● Type of measured value acquisition |
seamless |
● Curve shape of voltage |
Sinusoidal or distorted |
● Buffering of measured variables |
Yes |
● Parameter length |
74 byte |
● Bandwidth of measured value acquisition |
2 kHz; Harmonics: 39 / 50 Hz, 32 / 60 Hz |
Measuring range |
— Frequency measurement, min. |
45 Hz |
— Frequency measurement, max. |
65 Hz |
Measuring inputs for voltage |
— Measurable line voltage between phase and neutral conductor |
277 V |
— Measurable line voltage between the line conductors |
480 V |
— Measurable line voltage between phase and neutral conductor, min. |
0 V |
— Measurable line voltage between phase and neutral conductor, max. |
293 V |
— Measurable line voltage between the line conductors, min. |
0 V |
— Measurable line voltage between the line conductors, max. |
508 V |
— Internal resistance line conductor and neutral conductor |
3.4 M |
— Power consumption per phase |
20 mW |
— Impulse voltage resistance 1,2/50µs |
1 kV |
— Measurement category for voltage measurement in accordance with IEC 61010-2-030 |
CAT II; CAT III in case of guaranteed protection level of 1.5 kV |
Measuring inputs for current |
— measurable relative current (AC), min. |
1 %; Relative to the secondary rated current 5 A |
— measurable relative current (AC), max. |
100 %; Relative to the secondary rated current 5 A |
— Continuous current with AC, maximum permissible |
5 A |
— Apparent power consumption per phase for measuring range 5 A |
0.6 V·A |
— Rated value short-time withstand current restricted to 1 s |
100 A |
— Input resistance measuring range 0 to 5 A |
25 m At the terminal |
— Surge strength |
10 A; for 1 minute |
— Zero point suppression |
Parameterizable: 2 ... 250 mA, default 50 mA |
Accuracy class according to IEC 61557-12 |
— Measured variable voltage |
0,2 |
— Measured variable current |
0,2 |
— Measured variable apparent power |
0.5 |
— Measured variable active power |
0.5 |
— Measured variable reactive power |
1 |
— Measured variable power factor |
0.5 |
— Measured variable active energy |
0.5 |
— Measured variable reactive energy |
1 |
— Measured variable neutral current |
0.5; calculated |
— Measured variable phase angle |
±1 °; not covered by IEC 61557-12 |
— Measured variable frequency |
0.05 |
Potential separation |
Potential separation channels |
● between the channels and backplane bus |
Yes; 3 700V AC (type test) CAT III |
Isolation |
Isolation tested with |
2 300V AC for 1 min. (type test) |
Standards, approvals, certificates |
CE mark |
Yes |
CSA approval |
Yes |
UL approval |
Yes |
cULus |
Yes |
FM approval |
Yes |
RCM (formerly C-TICK) |
Yes |
KC approval |
Yes |
Marine approval |
Yes |
Ambient conditions |
Ambient temperature during operation |
● horizontal installation, min. |
-20 °C |
● horizontal installation, max. |
60 °C |
● vertical installation, min. |
-20 °C |
● vertical installation, max. |
50 °C |
Dimensions |
Width |
45 mm |
Height |
100 mm |
Depth |
75 mm |
Weights |
Weight, approx. |
165 g |
Other |
Data for selecting a current transformer |
● Burden power current transformer x/1A, min. |
As a function of cable length and cross section, see device manual |
● Burden power current transformer x/***, min. |
As a function of cable length and cross section, see device manual |