| 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 as of 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 update 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 |
| — 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 |
| — Internal resistance line conductor and neutral conductor |
3.4 MΩ |
| — Power consumption per phase |
20 mW |
| — Impulse voltage resistance 1,2/50µs |
1 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 mΩ; At the terminal |
| — Zero point suppression |
Parameterizable: 2 ... 250 mA, default 50 mA |
| — Surge strength |
10 A; for 1 minute |
| 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) |
| 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 (without packaging) |
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/5A, min. |
As a function of cable length and cross section, see device manual |
| last modified: |
11/10/2018 |
