38
FX
3U
-32DP PROFIBUS-DP Interface Block
User’s Manual
6 Buffer Memory Allocation
6.3 Data Exchange Status Register [BFM #20]
6.3
Data Exchange Status Register [BFM #20]
BFM Access : Read Only
This BFM shows the data exchange status.
The following values show the PROFIBUS-DP communication status.
6.4
Swap Byte Order [BFM #21 Bit0 and Bit1]
BFM Access : Read Only
This BFM determines the byte-order swap for the I/O data and diagnostic data.
*1
*1.
The 32DP does not swap the I&M data byte-order, therefore the I&M data byte-order is always the
high-byte followed by the low-byte.
Note
The Swap Byte Order can be set up by the DP-Master Configuration Tool. When using GX Configurator-DP,
the Swap Byte Order is specified in the Extended User Parameters for the Slave.
→
For details, refer to Subsection 7.1.2
6.5
Cyclic Input Data Length [BFM #22]
BFM Access : Read Only
This BFM shows the cyclic input data length. The valid range lies from 0 to 72 words. When the value is out of
the range, The 32DP writes "0xFF" to this BFM.
6.6
Cyclic Output Data Length [BFM #23]
BFM Access : Read Only
This BFM shows the cyclic output data length. The valid range lies from 0 to 72 words. When the value is out
of the range, The 32DP writes "0xFF" to this BFM.
Bit No.
Name
Description
Bit 0
Data Exchange Bit
ON when the 32DP is in the Data Exchange Mode
Bit1
Clear/Fail-Safe State
ON when the 32DP is in the Clear/Fail-Safe status
Bit2 to Bit15
Not Available
−
Value
Description
K0
The 32DP is in STOP/OFFLINE mode
BFM25 Bit0 is " 0 " when the 32DP established no communication, the 32DP is OFFLINE
BFM25 Bit0 is " 1 " when the 32DP established a communication, the 32DP is ONLINE
K1
The 32DP is in RUN mode
K3
The 32DP is in Clear/Fail-Safe mode
Bit No.
Name
Description
Bit 0
Cyclic Data Swap Byte Order
When turning this bit ON, the 32DP swaps the low and high byte
of cyclic I/O data and diagnostic (alarm) messages
Bit1
Acyclic Data Swap Byte Order
When turning this bit ON, the 32DP swaps the low and high byte
of acyclic I/O data
Bit2 to 15
Not Available
−
Summary of Contents for FX3U-32DP
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