Siemens 500 NIM - Manual (Page 80)

NIM Primitives 4-27 SIMATIC TIWAY I Series 500 NIM User Manual
Table 4-7 Maximum Write Primitive Byte Length
Write Primitive
Maximum number of
written per Primitive
(When using extended
address)
30
267
265
31
265*
263*
52
263
261
57
265**
263**
bytes that may be
request.
* This number assumes that only one data element is requested. Use the
one of the following formulas for the general case of one or more
where:
N = maximum number of bytes which may be written in this
Primitive request.
T = total number of writes specified in the Primitive request.
** This number assumes that only one record is requested. Use the formula
below for the general case of one or more records requested:
N = 266 - C, where: C = total number of records in this Primitive.
or
Extended addressing: N = 264 - C
Consult
for the maximum available data element address.
data types:
Normal addressing: N = 270 - (5 * T)
Extended addressing: N = 270 - (7 * T)
for the number of bytes in each data element, and Table 4-4
Table 4-5