GE VersaPoint IC220PBI002 User Manual page 135

Example 5, In the Event of an Error: Reading a Non-Existent Object on an
I/O Module with PCP Functions (Access to 5C00, Subindex 0 on a
VersaPoint RS-232 Communications Module, Slot 3)
This example write request has a similar structure to example 2. However, instead
of index 5FFF and subindex 2, index 5C00 and subindex 00 are requested.
As in example 2, the write response is used to indicate that the command has
been received. Processing on the I/O Station local bus starts afterwards. 81
indicates the execution of the command, and 44
In this example, the PCP Read cannot be processed because the object does not
exist. The problem is indicated by the error code 06
data of the read response. The 2 bytes at the end may provide additional
information about an error, but they are not used in this case. The error is on the
lower-level local bus; it is not a DP/V1 error. 44
indicates an I/O module error.
Write request (master -> slave)
Data
5F 03 30 04 01 5C 00 00
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 06 81 44 06 07
00 00
GFK-1911B Chapter 8 Communications
indicates a basic error.
hex
hex
as the response status always
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/6 bytes of object data
hex
and 07 within the object
hex
8
8-15