Table of Contents
Advertisement
8
Start Fragment
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
...
Byte n
Byte 1 - Service in start fragment:
7
Request/
response
Bit 7:
Bits 6 to 5:
Bit 4
Bits 3 to 0:
In the start fragment, enter the Invoke ID for actions 6 and 7 (read/write with the
Invoke ID) after the module number. Bytes 3 to n are then entered at byte 4.
Actions 01
hex
used to access PCP modules. Actions 03
objects on the NIU (object indices 2 to 5).
8-18
VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
Service
Module number
Index high
Index low
Subindex
Length, if required
Data block, if required
Data block, if required
6
5
Fragment
0
0
Request/response
0 = Request
1 = Response
Fragment type
00 = Start fragment
Fragmentation
0 = Not fragmented
1 = Fragmented
Action
00
No action (clear)
hex
01
Read PCP (I/O module)
hex
02
Write PCP (I/O module)
hex
03
Read (bus coupler)
hex
04
Write (bus coupler)
hex
05
Read PDU length (displayed in bytes)
hex
06
Read PCP with Invoke ID (I/O module)
hex
07
Write PCP with Invoke ID (I/O module)
hex
08
to 0F
Reserved
hex
hex
and 02
, and 06
and 07
hex
hex
4
3
-ation
refer to PCP; these commands can be
hex
and 04
are used to read or write
hex
hex
2
1
Action
GFK-1911B
0
- Quick Links:
- Dip Switches on the Niu
- Leds on the Niu
Hide quick links:
Advertisement
Table of Contents
