7 i/o port and data reading and writing – IAI America XSEL-S User Manual
Page 32
3. XSEL-R/S/RX/SX/RXD/SXD
26
3.7 I/O Port and Data Reading and Writing
The initial setting of SEL language commands for the operation of I/O (input and output) ports
of XSEL Controller is set to execute reading and writing without the data being exchanged.
Shown below is an example for the assignments on the EtherCAT® master side and XSEL
controller side.
[XSEL side output domain � EtherCAT® master side input domain]
Address
Bit 7
(MSB)
6
5
4
3
2
1
0
(LSB)
XSEL Output Port Number
307
306
305
304
303
302
301
300
EtherCAT®
Input word address
0
(lower-order byte)
XSEL Output Port Number
315
314
313
312
311
310
309
308
EtherCAT®
Input word address
0
(host byte)
XSEL Output Port Number
323
322
321
320
319
318
317
316
EtherCAT®
Input word address
1
(lower-order byte)
XSEL Output Port Number
331
330
329
328
327
326
325
324
EtherCAT®
Input word address
1
(host byte)
• •
•
� Example Data (1234h) from XSEL is changed to 1234h in EtherCAT®.
HEX
1
2
3
4
XSEL
BIN
0001
0010
0011
0100
HEX
1
2
3
4
Ether CAT® Master
BIN
0001
0010
0011
0100
[EtherCAT® master side output domain � XSEL side input domain]
Address
Bit 7
(MSB)
6
5
4
3
2
1
0
(LSB)
XSEL Input Port Number
7
6
5
4
3
2
1
0
EtherCAT®
Output word address
0
(lower-order byte)
XSEL Input Port Number
15
14
13
12
11
10
9
8
EtherCAT®
Output word address
0
(host byte)
XSEL Input Port Number
23
22
21
20
19
18
17
16
EtherCAT®
Output word address
1
(lower-order byte)
XSEL Input Port Number
31
30
29
28
27
26
25
24
EtherCAT®
Output word address
1
(host byte)
• •
•
� Example Data (1234h) from EtherCAT® master is changed to 1234h in XSEL.
HEX
1
2
3
4
EtherCAT® Master
BIN
0001
0010
0011
0100
HEX
1
2
3
4
XSEL
BIN
0001
0010
0011
0100