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FX
3U
-32DP PROFIBUS-DP Interface Block
User’s Manual
6 Buffer Memory Allocation
6.17 Start/Stop DP Communication [BFM #36 Bit0]
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6.17
Start/Stop DP Communication [BFM #36 Bit0]
BFM Access : Read / Write
This BFM manually starts/stops the 32DP’s DP Communication. The BFM value decides the 32DP’s
communication state as follows.
6.18
Consistency Handling Error Flags [BFM #37]
BFM Access : Read / Write (Valid Value : 0 only)
This BFM shows Consistency Handling Error Flags. A consistency error occurs when users read/write BFMs
while they are being accessed by another instruction.
Error Status Register BFM#29 Bit5 also turns ON when a consistency error occurs. By resetting BFM#29
Bit5, BFM#37 resets. By writing 0 to BFM#37, BFM#29 Bit5 resets as well as Consistency Handling Error
Flags.
→
For details on BFM#25 Bit8, refer to Section 6.8
*1.
Also refer to BFM#27.
→
For details on BFM#27, refer to Section 6.10
Note
A consistency error also occurs when users monitor the output data receive area of the 32DP BFMs in data
consistency mode with programming Software (i. e. GX Developer).
Bit No.
Description
Bit0 = 0
The 32DP stops the DP Communication when the PLC is in STOP
The 32DP starts the DP Communication when the PLC is in RUN
Bit0 = 1
The 32DP stays in the DP Communication regardless of the PLC RUN/STOP
Bit No.
Name
Description
Bit 0
Cyclic Input Data Exchange Consistency
Error
ON when writing to the cyclic Input-Send Area while
BFM#99 is 0
Bit 1
Cyclic Output Data Exchange Consistency
Error
ON when reading the Cyclic Output Data Receive Area
while BFM#299 is 0
Bit 2
Acyclic Class1 Input Data Exchange
Consistency Error
ON when writing to the Acyclic Input Data Send Area
while BFM#499 is 0
Bit 3
Acyclic Class1 Output Data Exchange
Consistency Error
ON when reading the Acyclic Output Data Receive Area
while BFM#699 is 0
Bit 4
Acyclic Class2 Input Data Exchange
Consistency Error
ON when writing to the Acyclic Input Data Send Area
while BFM#899 is 0
Bit 5
Acyclic Class2 Output Data Exchange
Consistency Error
ON when reading the Acyclic Output Data Receive Area
while BFM#1099 is 0
Bit 6 to 7
Not Available
−
Bit 8
Slave Diagnostics Send Consistency Error
ON when writing to the diagnostic/alarm(status) data
area while BFM#1300 is 1
Bit 9
Change Slave Address Consistency Error
ON when changing the 32DP address while the 32DP is
in Data Exchange mode or BFM#25 Bit8 (Address
Change Impossible Flag) is ON
Bit 10
Change Slave Address EEPROM Error
ON when changing the 32DP address more than once in
5 seconds
*1
Bit 11 to 15 Not Available
−
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