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MAILBOX COMMAND
PARAMETER DATA INPUT
AREA MAPPING
D485 MODBUS TO DEVICENET CONVERTER – USER GUIDE
Advanced fieldbus configuration
The mailbox commands are for advanced usage of the D485. Right clicking on the Fieldbus
sub-menu items provides an option of inserting a mailbox.
By default, all mapped I/O input data is grouped in one attribute and is used for polled
production (input) data, and all mapped I/O output data is used as polled consumed
(output) data. The mailbox commands are used to split the I/O data and explicit data into
different attributes. These attributes can be configured for polling, COS, and strobe I/O
messaging through the DeviceNet master.
This command makes it possible to map attributes in the parameter data input mapping
object (class B0h). By mapping data, a Get_Attribute_Single command from the DeviceNet
master to the parameter data input mapping object can return a specified block of data.
Up to 50 attributes can be mapped in this object. Attributes are mapped with start of
attribute 1. Offset is set from the start of the parameter data input area and the length
specifies the amount of bytes to map. Attribute 1 in the mailbox is followed by attribute 2,
and continues to attribute 50. If length is set to zero, the attribute will not exist. As such, it is
possible to map only object 1 and 10 by letting the length of attributes 2 through 9 be zero.
It is only necessary to include mailbox information up to the last attribute number.
If any offset or length is invalid, the length and offset will be set to zero in the mailbox
answer and the attribute will not be mapped.
Parameter
Description
Command initiator
Application
Command name
PARAMETER_INPUT_MAP
Message type
02h
Command number
0004h
Fragmented
No
Extended header data
---
Command data
Offset and length of the attributes to map
Response data
Indicates if the message was accepted
Figure 8-3: Mailbox command
ADVANCED FUNCTIONS
8–5
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