12.2.4 Description of the I/O area (read/write window)
12.2.4.1 Input section
Data transmission from the master to the PR 5220 (slave) is via the input area.
Weight or data requests are transmitted to the slave by the master.
The master has write access; the slave has read access.
Byte Name Description
0 Write_Value (MSB) e.g.limit value
1 Write_Value (MSB) e.g.limit value
2 Write_Value (MSB) e.g.limit value
3 Write_Value (LSB) e.g.limit value
4 Read_Value_Select e.g.gross
5 Write_Value_Select Write: Limit 1 On
6 Free Res
M3
Res
M2
Res M1 Free Set M3 Set M2 Set M1 Free/digital outputs
7 Get
FixTare
Set
FixTare
Res
Power
Res
Test
Set
Test
Res
Tare
Set Ta-
re
Set
Zero
"Control byte", response to 0→1
transition
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
The "Control byte" activates the corresponding action in the device with a "Set-Bit".
After execution of the operation, the bit should be reset.
Variable Function
Write_Value The weight value is transmitted as a binary 32-bit value with plus or minus sign.
Type of data: DINT
Read_Value_Select For selecting the value sent by the device.
Write_Value_Select For selecting the function to be executed by the device.
GetFixTare The gross weight is copied into the preset tare memory.
SetFixTare Taring is performed using the value stored in the preset tare memory.
ResPower The Power_Fail bit in the output area is deleted.
ResTest The test operating mode is nished.
SetTest The test operating mode is started. Now the test value can be read out by reading
the gross weight.
ResTare Tare is reset.
SetTare Tares the scale.
SetZero The scale is set to zero.
Res M13 Marker 13 is reset.
4. Wait until Write_Active = 1 (acknowledges data receipt).
5. Write 0 in byte 5 (Write_Value_Select)
Write_Active goes to 0.
Transmitter Series PR 5220 12 Fieldbus interface
Minebea Intec EN-192
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