Compatible Devices
Siemens Simovert drives via USS protocol [g3-simouss | Word]
Verified Device
Siemens Simovert MicroMaster 420 [g3-simouss | Word]
Accessible Data
Parameters
| Prefix | Description | Element Size | Minimum | Maximum |
|---|---|---|---|---|
| P | Parameters | 16 or 32 bits | 0 | 9999 |
Process Data
| Prefix | Description | Element Size | Direction |
|---|---|---|---|
| STW | Control Word | 16 bits | To Simovert |
| HSW | Frequency Word | 16 bits | To Simovert |
| ZSW | Status Word | 16 bits | From Simovert |
| HIW | Actual Value | 16 bits | From Simovert |
Notes:
- Refer to the Simovert manual for Control Word bit definitions
- HSW represents frequency demand;
0x4000 = 100%of configured scale [g3-simouss | Word]
USS PZD and PKW Length Parameters
- USS PZD Length: Number of process data words
-
USS PKW Length:
- 3 → 16-bit data only
- 4 → 32-bit data only
- Recommended: variable (supports both)
Settings must match between the driver and the Simovert device. [g3-simouss | Word]
Sending Commands
Commands are sent using:
- STW (Control Word)
- HSW (Frequency Word)
- SEND (trigger command)
Procedure
- Set STW to desired control value
- Set HSW to desired frequency
- Write non-zero value to SEND
Important:
- If HSW is not used, it must be set to
0before sending the command [g3-simouss | Word]
Examples
Run at 50% frequency:
STW = 0x047F HSW = 0x2000 SEND = non-zero
Stop inverter:
STW = 0x047D HSW = 0x0000 SEND = non-zero
Default Communication Settings
| Parameter | Value |
|---|---|
| Port | RS485 |
| Baud Rate | 9600 |
| Data Bits | 8 |
| Parity | Even |
| Stop Bits | 1 |
| Device Address | 1 |
Operational Note
The driver uses a pass-through approach:
- No validation of values is performed
- User must ensure correct system configuration and device operation [g3-simouss | Word]
Communications
Place Photo Here
| RLCRS485PORT | MICROMASTER420 RS485 PORT |
|---|---|
| Pin 2 | Pin 15 |
| Pin 1 | Pin 14 |
| Pin 6 (Comm.) | — |
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