GE VersaPoint IC220PBI002 User Manual page 127

8
Parameter Definitions
<DP/V1 service>
In the request there is a distinction between DP/V1 Read (5E hex ) and DP/V1
Write (5F hex ); in the error response there is a distinction between DE hex (Read
error) and DF hex (Write error).
<Slot>
The slot of the VersaPoint module to be addressed in the I/O Station. The NIU is
addressed using Slot = 0, the first I/O module using Slot = 1, the second using Slot
= 2, etc. The slot provides a reference to a specific module, e.g., also for the
module parameters.
<DP/V1 index>
The Index Number that should be used for accessing local bus communication
objects is 48 dec (30 hex). Indices 2 to 5 should be used for all other services.
Index 47 dec is reserved for future use and should therefore not be assigned.
<DP/V1 length>
On a write access, the length of the subsequent data is entered here. On a read
access, the length of the expected data is entered. On a response, this parameter
contains the actual length of the DP/V1 data.
<Error data (PCP/DP/V1)>
Contains the error codes from the PCP access to the local bus.
<Error decode>
80 hex indicates an error in DP/V1.
<Error code 1> and <Error code 2>
Contain the error codes from the DP/V1 access.
<Write PCP/Read PCP>
Indicates whether the following object index should be written or read.
Read PCP = 01 hex ; Write PCP = 02 hex .
<Object data>
The content of an object whose length and scope is described by <DP/V1 length>.
<Index high and Index low>
Specifies the Object Index of the addressed PCP object in two bytes. For
example, for index 5FE0 hex the value 5F hex should be entered for Index high
and the value E0 hex should be entered for Index low.
<Subindex>
When working with a PCP object, the subindex can be used to select a specific
element from an array or record.
GFK-1911B Chapter 8 Communications 8-7