Siemens SIMATIC S7-1200 System Manual page 1159

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Table 13- 50 Data types for the parameters

Parameter and type

The DONE bit indicates that valid data has been read from the referenced motor drive and delivered to the CPU. It does

not indicate that the USS library is capable of immediately reading another parameter. A blank PKW request must be

sent to the motor drive and must also be acknowledged by the instruction before the parameter channel for the specific

drive becomes available for use. Immediately calling a USS_Read_Param or USS_Write_Param FC for the specified

motor drive will result in a "0x818A" error.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Send request: When true, REQ indicates that a new write request is de-

sired. This is ignored if the request for this parameter is already pending.

Drive address: DRIVE is the address of the USS drive. The valid range is

drive 1 to drive 16.

Parameter number: PARAM designates which drive parameter is written.

The range of this parameter is 0 to 2047. On some drives, the most signif-

icant byte can access PARAM values greater than 2047. See your drive

manual for details on how to access an extended range.

Parameter index: INDEX designates which Drive Parameter index is to be

written. A 16-bit value where the least significant byte is the actual index

value with a range of (0 to 255). The most significant byte may also be

used by the drive and is drive-specific. See your drive manual for details.

Store To Drive EEPROM: When true, a write drive parameter transaction

will be stored in the drive EEPROM. If false, the write is temporary and

will not be retained if the drive is power cycled.

Word, Int, UInt,

The value of the parameter that is to be written. It must be valid on the

DWord, DInt,

transition of REQ.

The name of the instance DB that is created and initialized when a

USS_Drive_Control instruction is placed in your program.

When true, DONE indicates that the input VALUE has been written to the

drive. This bit is set when USS_Drive_Control sees the write response

data from the drive. This bit is reset when either you request the response

data using another USS_Drive_Control poll, or on the second of the next

two calls to USS_Drive_Control.

When true, ERROR indicates that an error has occurred and the STATUS

output is valid. All other outputs are set to zero on an error. Communica-

tion errors are only reported on the USS_Port_Scan instruction ERROR

and STATUS outputs.

STATUS indicates the result of the write request. Additional information is

available in the "USS_Extended_Error" variable for some status codes.

Communication processor and Modbus TCP

13.4 Universal serial interface (USS) communication

Siemens SIMATIC S7-1200 System Manual page 1159

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