Watson-Marlow MM420 - Manual (Page 111)

Issue 10/06 3 Functions
MICROMASTER 420 Operating Instructions
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mandatory to parameterize for a variable word length, if e.g. all values are to be
read at once from an “indexed” parameter (refer to "Index", special setting, index =
255). This setting to variable word-length is made during start-up. (refer to
parameter P2013).
Parameter ID (PKE) 1 st word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit No.:
AK
SP
M
PNU1
Parameter index (IND) 2 nd word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit No.:
PNU2 RES TXT Index
Parameter value (PWE)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit No.:
Parameter value, high (PWE1) 3 rd word
Parameter value, low (PWE2) 4 th word
The following applies:
AK Task or reply ID
SPM Toggle bit for processing of parameter-change reports
(MICROMASTER does not support this, SPM = 0)
PNU Parameter number
RES Reserved
TXT Read / write from parameter text
(MICROMASTER does not support this, TXT = 0)
CAUTION
Do not use a variable word length if SIMATIC S5 or SIMATIC S7 is the master.
This setting must be made both at the master as well as at the slave – and
cannot be changed while the bus is operational.
NOTE
The PKW area is transferred in increasing order, always starting with the 1st
word.
Reserved fields or functions that are not supported should be specifically pre-
assigned zero in the master implementation.
The bit 11 (SPM) is the toggle bit for parameter change reports. Parameter
change reports when reading/writing parameter texts are not supported by
MICROMASTER.