Data Exchange Status Register [Bfm #20]; Swap Byte Order [Bfm #21 Bit0 And Bit1]; Cyclic Input Data Length [Bfm #22]; Cyclic Output Data Length [Bfm #23] - Mitsubishi FX3U-32DP User Manual

FX -32DP PROFIBUS-DP Interface Block
3U
User's Manual
6.3

Data Exchange Status Register [BFM #20]

This BFM shows the data exchange status.
Bit No.
Bit 0 Data Exchange Bit
Bit1 Clear/Fail-Safe State
Bit2 to Bit15 Not Available
The following values show the PROFIBUS-DP communication status.
Value
The 32DP is in STOP/OFFLINE mode
K0 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
6.4

Swap Byte Order [BFM #21 Bit0 and Bit1]

This BFM determines the byte-order swap for the I/O data and diagnostic data.
Bit No.
Bit 0 Cyclic Data Swap Byte Order
Bit1 Acyclic Data Swap Byte Order
Bit2 to 15 Not Available
*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.
6.5

Cyclic Input Data Length [BFM #22]

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]

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.
38
Name
ON when the 32DP is in the Data Exchange Mode
ON when the 32DP is in the Clear/Fail-Safe status
Name
When turning this bit ON, the 32DP swaps the low and high byte
of cyclic I/O data and diagnostic (alarm) messages
When turning this bit ON, the 32DP swaps the low and high byte
of acyclic I/O data
Description
−
Description
Description
−
→ For details, refer to Subsection 7.1.2
6 Buffer Memory Allocation
6.3 Data Exchange Status Register [BFM #20]
BFM Access : Read Only
BFM Access : Read Only
*1
BFM Access : Read Only
BFM Access : Read Only