SEW-Eurodrive MOVIPRO Ethernet/IP - Page 112

9
Modbus protocol (Modbus/TCP)
Parameter access via Modbus/TCP
Manual – MOVIPRO
®
with EtherNet/IP™ or Modbus/TCP Fieldbus Interface
112
You can access the parameter channel with FC03, FC16 and FC23. You can assign a
task to the parameter channel in the administration byte when using a write access.
The task itself is a MOVILINK
®
service such as "Write", "WriteVolatile" or "Read". The
result is read with a read access.
The values in the example (writing fieldbus timeout) have the following meaning:
• Offset 200
hex
= 3200
hex
(administration = write 4bytes/subindex = 0)
• Offset 201
hex
= 219E
hex
(Index = 8606)
• Offset 202
hex
= 0 (data high)
• Offset 203
hex
= 01F4
hex
(data low = 500)
Management byte
The management byte in the MOVILINK
®
parameter channel (byte 0) is defined as fol-
lows:
Management byte (1byte)
Bit Meaning Coding and function
0
(LSB)
Service identifier
0000 = No service
0001 = Read parameter
0010 = Write parameter
0011 = Write Parameter Volatile
0100 = Read minimum
0101 = Read maximum
0110 = Read default
0111 = Read scale
1000 = Read attribute
1
2
3
4
Data length
00 = 1bytes
01 = 2bytes
10 = 3bytes
11 = 4bytes
5
6 Data length
Must be changed (toggled) on every new
task in cyclical transmission.
7
(MSB)
Status bit
0 = No error during execution of service
1 = Error during execution of service
The individual bits have the following functions:
• Bits0–3
Contain the service identification. These bits determine which service is to be ex-
ecuted.
• Bit4 and Bit5
Specify the data length in byte. For inverters from SEW‑EURODRIVE, this value
must always be set to 4bytes.
16998413/EN – 12/2016