GE VersaPoint IC220PBI002 User Manual page 132

8
Example 2, Reading Object 5FFF; Subindex 2 of a VersaPoint RS-232
Module on Slot 3, Accessing an I/O Module
This example illustrates how the write and read sequence provides the requested
value when a value is read. In this case, the write response does not contain any
data. It simply indicates that a write request was received at the Profibus-D/V1
NIU. The data is only delivered by the read action.
81 means that PCP read has been executed. The status is 00
hex
indicates that there were no errors. 01
data and 07
object elements" on page 3-15.
Write request (master -> slave)
Data
5F 03 30 04 01 5f ff 02
Write response (slave -> master)
Data
5F 03 30 04
Read request (master -> slave)
Data
5E 03 30 28
Read response (slave -> master)
Data
5E 03 30 04 81 00 01 07
8-12 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
is the value stored under 5FFF, subindex 2, see "INIT-TABLE
hex
Data Structure
Write/Slot/Index/Length/Read PCP/Index high/Index
low/Subindex
Data Structure
Write/Slot/Index/Length
Data Structure
Read/Slot/Index/Maximum length
Data Structure
Read/Slot/Index/Actual length/4 bytes of object data
indicates the length of the subsequent
hex
, which
hex
GFK-1911B