Iai-america XSEL Ethernet Manuel d'utilisateur télécharger pdf (Page 25)

- 19 -

4.4.1 Little Endian Operation

The default endian mode of DI/DO operation commands of the X-SEL controller is the little endian.

In the little endian mode, the remote I/O field accessed via word operation with an IN, INB, OUT or

OUTB command of the X-SEL controller will have its upper and lower bytes reversed in relation to

the X-SEL data if the same field is word-accessed via Modbus/TCP.

The following examples are based on 256-bit assignments from the head DO number (= 300) in

X-SEL as Modbus/TCP remote I/Os.

(Note) Remote I/Os can be defined only as consecutive numbers.

The assignable head number must satisfy: 300 + 8n (31  n  0).

The total number of assignable bits must satisfy: m + n < 32 & 32  m, where m represents

the number of assigned remote I/O bytes.

[Modbus/TCP input areas (assignment of X-SEL DO area 300 onward)]

Address

BIT7

(MSB)

6 5 4 3 2 1

(LSB)

X-SEL DO 307 306 305 304 303 302 301 300

Modbus/TCP bit address 0 1 2 3 4 5 6 7

Modbus/TCP word address 0 Lower byte

Modbus input status 10001 10002 10003 10004 10005 10006 10007 10008

Modbus input register 30001 Lower byte

X-SEL DO 315 314 313 314 315 310 309 308

Modbus/TCP bit address 8 9 10 11 12 13 14 15

Modbus/TCP word address 0 Upper byte

Modbus input status 10009 10010 10011 10012 10013 10014 10015 10016

Modbus input register 30001 Upper byte

X-SEL DO 547 546 545 544 543 542 541 540

Modbus/TCP bit address 240 241 242 243 244 245 246 247

Modbus/TCP word address 15 Lower byte

Modbus input status 10248 10249 10250 10251 10252 10253 10254 10255

Modbus input register 30016 Lower byte

X-SEL DO 555 554 553 552 551 550 549 548

Modbus/TCP bit address 15 Upper byte

Modbus/TCP word address 248 249 250 251 252 253 254 255

Modbus input status 10249 10250 10251 10252 10253 10254 10255 10256

Modbus input register 30016 Upper byte

Cannot be used

Input status: input discretes single bit, provided by an I/O system, read-only

Output coil: output discretes single bit, alterable by an application program, read-write

Input register: input registers 16-bit quantity, provided by an I/O system, read-only

Output register: output registers 16-bit quantity, alterable by an application program, read-write

The output areas are described on the next page.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 59 60

Commentaires sur ces manuels

Pas de commentaire

Iai-america XSEL Ethernet Manuel d'utilisateur Page 25

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Iai-america XSEL Ethernet