48
FX
3U
-32DP PROFIBUS-DP Interface Block
User’s Manual
6 Buffer Memory Allocation
6.33 Acyclic Output Data Receive Area (Class2) [BFM #1100 to #1172]
6.33
Acyclic Output Data Receive Area (Class2) [BFM #1100 to #1172]
BFM Access : Read Only
This is a data storage area for acyclic output data from the DP-Master. This area stores a maximum of 140
Byte acyclic output data.
→
For details on Acyclic Communication, refer to Section 5.2
6.34
Reset Extended Diagnostic/Alarm Data Area Flag [BFM #1298]
Data consistency is necessary for the user-diagnostic and alarm (status) messages.
When the Extended User-Diagnostic/Alarm (Status) Data Area is not empty, this flag turns ON. Writing "0" to
BFM#1298 clears the Extended User-Diagnostic/Alarm (Status) Data Area, whereas this BFM is available
only when the DP-Master acknowledges all the Alarm Messages.
When writing "0" to BFM#1298 before the DP-Master acknowledges all the Alarm Messages, BFM#38 Bit12
turns ON to show the setting error.
→
For details on BFM#38, refer to Section 6.19
6.35
Alarm/Status Switch [BFM #1299 Bit0]
BFM Access : Read / Write
When the communication protocol is DP-V1 (BFM#35 Bit0 is ON), the 32DP transfers its diagnostic data by
default as an Alarm Message with high priority. The Alarm Message needs to be acknowledged by the DP-
Master. When this alarm acknowledging protocol is unnecessary, the diagnostic data can be sent with lower
priority by specifying the data as a Status Message (setting BFM#1299 Bit0 to ON).
The 32DP diagnostic data varies depending on BFM#1299 Bit0 as follows.
Note
• BFM#35 Bit2 corresponds to BFM#1299 Bit0
• When enabling Alarm Message (BFM#1299 Bit0 is OFF) while DP-V1 acyclic services are disabled
(BFM#35 Bit0 is OFF), the Alarm/Status Switch Error (BFM#1299 Bit13 ON) occurs.
• BFM #1299 Bit0 can only be set or reset when DP-V1 support and Diagnostic Alarm support are enabled
with the DP-Master Configuration Tool.
→
For details on BFM #35, refer to Section 6.16
→
For details on BFM #38, refer to Section 6.19
→
For details on enabling DP-V1 support, refer to Subsection 7.1.1
BFM No.
Name
Description
Access
BFM #1100 Slot Number
Number of the slot whose data has been read. This number is defined by
the addressing for acyclic services.
Only Slot 0 possible, must be set by the DP-Master
Read Only
BFM #1101 Index
Indicates the index of the data being sent.
Only Index 144 possible, must be set by the DP-Master
Read Only
BFM #1102 Length
Length of the data, which has been read (size of Data in Byte). The valid
range is 0 to 140.
Read Only
BFM #1103
to #1172
Data
Acyclic User Output Data being received by the DP-Master.
Read Only
Bit No.
Name
Description
Bit 0
Alarm/Status Switch
OFF when the diagnostic message is transferred as Alarm Message with
high priority, requiring the DP-Master acknowledging
ON when the diagnostic message is transferred as Status Message with
low priority, requiring no DP-Master acknowledging
Bit 1 to 15
Not Available
-
Summary of Contents for FX3U-32DP
Page 1: ...USER S MANUAL FX3U 32DP PROFIBUS DP Interface Block ...
Page 2: ......
Page 6: ... iv ...
Page 73: ......
