GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual
(Version 1.35, May/2017)
PAGE: 77
Header Parameters
.
Figure 71 Read request Parameters
Table 23 Telegram Header Parameters
Parameters
Value
Meaning for DPV1
Device Adr.
0x01
PROFIBUS station address of GW-7553
Data Area
0x00
Unused
Data Adr.
0x03
Slot number
Data Idx.
0x00
Index
Data Count
0x01
Length
Data Type
0x0A
Unused
Function
0x01
Read
In this case, slot 3 is used for “Input Relay/Coil--2 Byte” (see
Figure 39
),the
DO value of index 0 is “0x01”.