Moeller S40-AM-TD, Руководство пользователя

Страница: 61 / 85

Function Blocks
58
02/02 AWB27-1300-GB
Service 17: Send/read fixed frame length RAM data
When this service is called, “fixed_length” data bytes are
transferred in a fixed length frame from the RAM send data
array of Station A to the RAM receive data array of station B.
After transfer from station A to station B, “fixed_length”
data is transferred in the opposite direction from the send
data array of station B to the receive data array of station A.
Figure 11: Service 17: Send/read fixed frame length RAM data
In all stations using the service, the “fixed_length”
parameter must be identical.
2 0 1 . . . 255
10
30
40
50
60
70
80
90
219
0
.
.
2 0 1 . . . 255
10
20
40
50
60
70
80
90
219
0
.
.
30
20
fixed_length
2 0 1 . . . 255
10
30
40
50
60
70
80
90
219
0
.
.
2 0 1 . . . 255
10
20
40
50
60
70
80
90
219
0
.
.
30
20
fixed_length
Subadress
RAM receive data array
Station A
Subadress
Offset
address
RAM send data array
Station B
Offset
address
Subaddress
RAM receive data array
Subaddress
Offset
address
RAM send data array
Offset
address
RAM send data fixed
frame length
RAM read data fixed
frame length
Station A Station B