Read/write function block data, Read/write function block data -20 – Rockwell Automation 1760-DNET Pico DeviceNet Communications Module User Manual User Manual
Page 100
Publication 1760-UM003A-EN-P - September 2005
7-20 Pico GFX Control Commands
Read/write function block
data
Always note the following when working with function blocks:
• The relevant data is transferred in Intel format. In other words,
the first byte is the low byte (Byte 4) and the last byte (byte 7)
the high byte.
• The maximum data length is 4 bytes. All values must be
transferred in hexadecimal format.
• All 32-bit values are treated as signed values. When transferring
32-bit values, ensure that the appropriate value range is suitable
for long integers, i.e. signed.
32-bit value: –2147483648 .. 0 .. +2147483647
For SN1 – SN32: 0A
For SN1 – SN32: 0A
2
3
Index
01 – 08
(1)
01 – 08
(1)
3 – 6
4 – 7
Data 1 – 4
00
(1) Corresponds to NET-ID
Table 6.97 Byte 4 to 7: Data 1 to 4
Data 1
Bit
7
6
5
4
3
2
1
0
RN1
SN1
...
0/1
...
0/1
RN8
SN8
0/1
Data 2
Bit
7
6
5
4
3
2
1
0
RN9
SN9
0/1
....
...
RN16
SN16
0/1
Data 3
Bit
7
6
5
4
3
2
1
0
RN17
SN17
0/1
...
...
RN24
SN24
0/1
Data 4
Bit
7
6
5
4
3
2
1
0
RN25
SN25
0/1
...
...
RN32
SN32
0/1
Table 6.96
Byte
Meaning
Value (hex), sent by
Master
Slave
Master
Slave