Siemens SICAMT7KG966
The Siemens SICAM T 7KG966 is a multifunctional digital measuring transducer for acquiring electrical quantities in industrial and utility power supply systems, including 1-phase, 3-wire, and 4-wire installations. This Modbus TCP template reads per-phase voltage and current for all three phases, per-phase and total active power, per-phase and total reactive power, and grid frequency. All values are delivered as IEEE 754 32-bit floats via function code 3 holding registers. Connecting the SICAM T 7KG966 to ModbusCloud Gateway gives installers and facility managers a continuous, cloud-based view of load balance, power quality, and energy flow without additional metering hardware.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 17, read only
- Brand
- Siemens
- Last updated
Registers (17)
17 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| voltage_l1 | V | Read | |||
| voltage_l2 | V | Read | |||
| voltage_l3 | V | Read | |||
| current_l1 | A | Read | |||
| current_l2 | A | Read | |||
| current_l3 | A | Read | |||
| voltage | V | Read | |||
| current | A | Read | |||
| active_power_l1 | W | Read | |||
| active_power_l2 | W | Read | |||
| active_power_l3 | W | Read | |||
| active_power | W | Read | |||
| reactive_power_l1 | W | Read | |||
| reactive_power_l2 | W | Read | |||
| reactive_power_l3 | W | Read | |||
| reactive_power | var | Read | |||
| frequency | Hz | Read |
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Use cases
- Monitor per-phase active power on L1, L2, and L3 to detect load imbalance across distribution panels.
- Track total reactive power over time to verify power factor correction equipment is operating correctly.
- Alert on voltage deviations on any of the three phases to catch transformer or supply issues early.
- Compare per-phase current readings against rated breaker capacity to prevent overload conditions.
- Verify grid frequency stability across sites and alert when readings drift outside the 49.5 to 50.5 Hz band.
Installation
Enable Modbus TCP on the SICAM T 7KG966 by opening the device web interface in a browser and navigating to the communication or Modbus section, then confirm the listening port is set to 502.
Connect the device to the same Ethernet LAN segment as the ModbusCloud Gateway, ensuring the SICAM T 7KG966 has a static IP address or a DHCP reservation so the address does not change.
In the ModbusCloud portal, add a new gateway, select Modbus TCP, enter the SICAM T 7KG966 IP address and port 502, then import the Siemens SICAM T 7KG966 template and assign the correct unit ID.
Verify the connection by spot-checking the frequency register in the portal live data view; the value should read close to 50.0 Hz under normal grid conditions.
Things to watch for
All register readings show NaN or zero. What is wrong?
The SICAM T 7KG966 returns IEEE 754 floats spanning two consecutive holding registers. If your Modbus client byte order is set to little-endian or swapped-word, all float values will decode as NaN or nonsense. Set your client to big-endian (MSB first, high word first) to match the device's native byte order.
The gateway connects but live data never updates. Why?
The SICAM T 7KG966 supports up to a limited number of simultaneous Modbus TCP connections. If another SCADA client or web session already holds all available connections, the ModbusCloud Gateway request will time out. Close other active Modbus TCP sessions or increase the poll interval to reduce connection pressure.
Phase voltage on L2 reads correctly but L1 and L3 look wrong.
Register addresses for voltage_l1 (200), voltage_l2 (202), and voltage_l3 (204) each occupy two registers (float32). Verify the read length in the gateway configuration covers at least 6 registers starting at address 200. A read-length mismatch causes only the first float to decode correctly while the others shift.
Reactive power values appear with the wrong sign for my installation.
The sign of reactive power depends on the direction-of-current parameterization inside the SICAM T 7KG966, which is configurable via the device web interface. Check the current direction setting in the communication or measurement section and adjust to match your wiring convention before trusting reactive power sign in dashboards.
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