INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 17)

tira56e1 (2010-02) PxG55x.cp
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On the left of the table, the instruction signatures of the master are listed according
to their function. On the right of the table, the corresponding normal responses (AK
Normal) and error codes (AK Error) transmitted by the slave are listed.
1) The master transmits an instruction to the slave and repeats that instruction
until it receives a response from the slave.
2) The slave keeps transmitting the response to the instruction until the master
transmits a new instruction.
3) The master marks the end of the first instruction cycle by setting AK to zero.
Only after that, a new instruction/response cycle may be started.
The PWE represents the data element to be transmitted. If a byte is to be trans-
mitted, that byte has to be in position 8 of the parameter channel. Integers are
transmitted with bytes 7 and 8. Double integer and float values are transmitted with
bytes 5 … 8.
The slave sends an error message on octet 7 and octet 8 (interpreted as INT16) in
case a request cannot be fulfilled.
Error code Meaning
0 Undefined slot
1 Parameter not changeable
2 Lower or upper value range limit overflow
3 Subindex error
4 No array
5 Data type error
6 Setting not allowed (only resettable)
7 Description element not changeable
8 Reserved
9 Reserved
10 Access group error
11 No operation sovereignty
12 Password error
13 Text not readable in cyclic data transfer
14 Name not readable in cyclic data transfer
15 No text array existent
16 Reserved
17
Instruction not processable due to bad behavior state
18 Other errors
19 Data not readable in cyclic error
20…100 Reserved
201 Already in requested state
202 Object state conflict
Instruction – response
sequence
4.3.2 PWE (process value)
4.3.3 Error code