Example 1: Read Parameter - Siemens sinamics dcp Operating Instructions Manual

Operation
8.4 Communication according to PROFIdrive
8.4.5.4

Example 1: Read parameter

Requirements
● The PROFIdrive controller has been commissioned and is fully operational.
● PROFIdrive communication between the controller and the device is operational.
● The controller can read and write data sets in conformance with PROFIdrive DPV1.
Task description
Following the occurrence of at least one fault (r2139.3 = "1") on drive object 2, the active
fault codes must be read from the fault buffer r0945[0] ... r0945[7].
The request is to be handled using a request and response data block.
Basic procedure
1. Create a request to read the parameters.
2. Invoke the request.
3. Evaluate the response.
Create the request
Parameter request
Request header
Parameter address
Information about the parameter request:
● Request reference:
The value is selected at random from the valid value range. The request reference
establishes the relationship between request and response.
● Request ID:
01 hex → This identifier is required for a read request.
● Axis:
02 hex → Drive 2, fault buffer with drive- and device-specific faults
● Number of parameters:
01 hex → One parameter is read.
● Attribute:
10 hex → The parameter values are read.
156
Request reference = 25 hex
Axis = 02 hex
Attribute = 10 hex
Parameter no. = 945 dec
Subindex = 0 dec
Request ID = 01 hex
Number of parameters = 01 hex
Number of elements = 08 hex
Operating Instructions, 05/2016, A5E34382853K
Offset
0 + 1
2 + 3
4 + 5
6
8
SINAMICS DCP