HIMA H41q User Manual

F 8628X (0650)
434
coded 16 bit word.
The start identity number corresponds to an identity number in the corresponding data pool of
the communication module. The number of variables determines the number of variables to be
transmitted beginning with the start identification number.
The size of window always comprises integer bytes and is determined by the data types defined
by the window and the number of data types (compressed or uncompressed).
The total of the sizes of the 4 export windows determines the user data length of the PROFIBUS
INPUT telegram. The total of the sizes of the 4 import windows determines the length of the OUT-
PUT telegram.
The user data length of INPUT and OUTPUT together must not exceed 256 bytes. With this e.g.
2048 Boolean variables may be transmitted.
In accordance with the limit value specified in the PROFIBUS EN 50170 standard, a maximum
of 240 bytes may be configured
for INPUT or OUTPUT (i.e. up to 1920 Boolean variables in one
direction).
The start identity number must have a value valid for the corresponding data pool of the commu-
nication module, i.e. a variable with this identity number must have been defined in this data pool.
Also, beginning with this variable, a number of further variables must have been defined.
A window may have a sequence of variables of different types (i.e. both Bool and Word). Data
are only compressed for the variables within one window.
If a window definition is not used, 0 must be entered for the start identification number and the
number of variables.
9.3 Addressing example
Figure 11:Example of address mapping for PROFIBUS-DP export variables
(and for import variables accordingly)
The two export variable windows from data pool 1 are placed transparently onto the PROFI-
BUS-DP. The PROFIBUS-DP INPUT telegram has a user data length of 59 bytes (0 to 58). It
has the following structure:
• 1st window: start of the variables beginning with identity no. 1. (1 dec = 0001 hex in big-
endian format); number of variables: 20 (20 dec = 0014 hex).
From identity no. 1 to 20, there are Word variables which cannot be compressed.
Each word variable requires 2 bytes. A user data length of 40 bytes is generated (byte
0 to 39).
C
ommunication module
Data pool
Data pool 1 for Export variables (EV)
0
40
58
word
bool
EV-0000
EV-0000
PR
O
FIBU
S
-DP INPUT telegram
(byte offset)
PROFIBUS Word
from offset 0 to 39
uncompressed
PROFIBUS Bool
from offset 40 to 58
compressed
1st window
word
1
150
Communication
Data pool
module identity no.
351
bool
151
20 Word variables from
identity number 1 on (address)
39
2nd window
150 Boolean variables from
identity number 200 on (address)

HIMA H41q Specifications

General

Brand	HIMA
Model	H41q
Category	Industrial Equipment
Language	English