Manual_GK473_DeviceNet_EN.doc
17/31
Baumer IVO GmbH & Co. KG
04.05.11
Villingen-Schwenningen,
Germany
7.2 Attribute 2: Transparent transfer of a SPA command
Class
Instance Attribute Access Rule
Name
DeviceNet
Data type
Default
Value
100 1
2
Transparent
Transfer
Service Code
0x32
(Vendorspecific)
Transparent transfer of SPA command
ARRAY[16]
of USINT
This object is for transparent transfer of all commands to the spindle position displays (SPA) utilizing the
vendor specific
service Code 0x32
.
Basically there is a transparent transfer of all commands under codes „A“...“z“ from DeviceNet Master to SPA
and vice-versa what enables addressing the SPAs individually or collectively by broadcast command. The
gateway does not verify whether a registered SPA is connected or not, neither the command code is verified.
The gateway replies to every command received by the DeviceNet-Master (PLC).
Response is by
•
transparent transfer of the SPA reply, if an individual SPA was addressed and duly replied
•
an abort message if the addressed SPA did not reply within the timeout window (approx. 100 ms)
Any timeout administered by the DeviceNet Master for monitoring of gateway reply should not be less than
400 ms.
The DeviceNet Master transmits to GK473 the
transmission
data
within
the limits
SOH
and
EOT
out of the
complete command to the addressed spindle position display (SPA). Length
is always 16 bytes
since digits
not utilized are filled up with
0
.
Example: Programming the target (profile no = 17; target = -12,50; SPA identifier 0)
SOH
Adr
Cmd Profile no. = 17
Target = -12,50
EOT
CRC
Transmission
01h
20h
53h
31h
37h
2Dh
30h
31h
32h
35h
30h
04h
FBh
In the other direction (responding SPA) start and stop token as well as CRC byte are taken out of the RS485
message which in its remaining content is transferred unchanged into the data block of a DeviceNet message
so that it will be available at the PLC as consistent input data.
Example: Programming the target (profile no = 17; target = -12,50; SPA identifier 0)
SOH
Adr
Cmd Profile no. = 17
Target = -12,50
EOT
CRC
Response
01h
20h
53h
31h
37h
2Dh
30h
31h
32h
35h
30h
04h
FBh
For details regarding content and format of SPA commands please refer to the respective user
manual.
