ProSoft Technology PS69-DPM User Manual page 71

PS69-DPM ♦ CompactLogix or MicroLogix Platform
PROFIBUS DPV1 Master
The slave diagnostic command can be executed by using the corresponding handshake
request bit HsReq0 in the Device Command Register (page 69). The result of the slave
diagnostic command can be read in the Slave Diagnostic field of the input array.
Byte Offset Structure Member
4 SLA
5 FNC
6 Reserved
7 Reserved
SLA := Slave Address
Address of the slave of which the diagnostic data are requested.
FNC := Function
If FNC is 0, the diagnostic data are requested from internal buffer of the Master. This is the
recommended method, because the master has always the most recent diagnostic data in
its internal buffer from the Slave.
If FNC is 1 the diagnostic data are requested directly from the slave itself. This is not the
preferred method because, this method causes additional bus loading and will influence the
bus cycle time.
Note: The same Slave Diagnostic function can also be executed by CIP message functionality described later in
this manual. Some types of the CompactLogix controller family do not support messaging. This method can be
used for controllers that only support I/O or I/O and CIP messaging. The slave diagnostic via I/O has the
limitation that it cannot show extended diagnostic information if a slave supports this. It can only give the
mandatory diagnostic information of a slave. Extended diagnostic information can be received with the CIP
message functionality.
Global Control Array
The Global Control array is a field of 4 bytes following the Device Command Register. The
Global Control request makes it possible, to send commands to one or several DP slaves. A
DP slave accepts a control command only from the DP master that has parameterized it.
This request makes it possible to do Sync and Freeze functions.
Note: The same Global Control function can be also executed by CIP message functionality described later in
this manual. Some types of the CompactLogix controller family do not support messaging. This method is used
only for controllers that support I/O not messaging.
Byte Offset Structure Member
8 SLA
9 CC
10 GS
11 Reserved
ProSoft Technology, Inc.
October 1, 2014
Data Type Description
SINT Slave Address
SINT Function
SINT Reserved
SINT Reserved
Data Type Description
SINT Slave Address
SINT Function
SINT Reserved
SINT Reserved
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