Operating Instructions – Electronic Motor DRC.-..-DAC
163
9
Transmitting individual parameters via AS-Interface
Communication with AS-Interface Double Slave GLK31A
9.3.3
Using the "Exchange request" service (example)
This example illustrates how to change individual parameters of the DRC inverter using
the CTT2 service "Exchange request" 0x1D. You can use this service as an alternative
to the "Read request" and "Write request" services to read or write DRC parameters.
First, check the communication by reading out the "ID object" using the "Read request"
service.
Next, all you have to do is execute a "Request" service. The AS-Interface response
telegram 0x5D already includes the MOVILINK
®
response of the DRC inverter.
The following parameters of the DRC inverter are to be changed:
• Ramp t11 up and t11 down to 0.5 s
• Fixed setpoint value n0 to 1000 rpm
In addition, the heat sink temperature is to be read.
Checking the
communication
Read out the ID object correctly to check proper communication between AS-Interface
master and GLK31A.
"Read request" service:
The slave replies after the system-related transmission times for parameters.
"Read response OK" response telegram:
CTT2 service
Code
Index Length
0x10
0x00
0x06
Code 0x10 =
Read request
Index 0x00 =
ID object
Length 0X06 =
Length of the ID object
CTT2 service
Code
Vendor ID
High
Vendor ID
Low
Device ID
High
Device ID
Low
Output/input
Firmware
version
0x50
0x00
0x0A
0x00
0x0A
0x00
0x01
Code 0x50 =
Read response OK
Vendor ID high 0x00 = High value of the vendor ID
Vendor ID low 0x0A = Low value of the vendor ID
=> Vendor ID = 0x000A
hex
= 10
dec
Device ID high 0x00 = High value of the device ID
Device ID low 0x0A = Low value of the device ID
=> Device ID = 0x000A
hex
= 10
dec
Output/input 0x00 =
No inputs and outputs
Firmware version 0x01