Atlas Copco Power Focus 4000 - Page 243

Fieldbus
9836 3123 01 243 (428)
Station Number
Station Number can be set from 1 to 64.
CC-Link Version
In CC-Link data is transferred via virtual memory on the network. Each device has deterministic
area in this memory. The minimum area is the 1 station area. One device occupy up to 4 station
memory area for own slave communication. Following diagram shows typical data one station
long:
PF, classified as Remote Device Station can use both RY (bit data) and RWw (word data) for
transfer of To/From PF Data.
Max data size in CC-Link version 1 is 48 bytes, which include 128 bit points (16 bytes) and 16
words (32 bytes) – when taking 4 station memory area.
Max data size in CC-Link version 2 is 368 bytes, which include 896 bit points and 128 words.
But PF limited the max data length to 200 for all the Fieldbus types. The length is depending not
only on number station areas taken but also on number of extension cycles. Max occupied station
is 4 and extension cycles are 8.
Data representation with CC-Link version 1
The module will use the data length defined in TTPF F102 and F103 to determine the number of
occupied stations, actual IO data size used on CC-Link as follow:
Data length
(in bytes)
Occupied
stations
Bit data
(in bytes)
Word data
(in bytes)
Description
0 < length ≤ 4
1
s
0
No word data
4 < length ≤ 12
4
length - 4
Word data range 1-8 bytes