Digital Watchdog x39 Manuel de service télécharger pdf (Page 154)

Linkage with PLC

152 VIPA GmbH CP486 ⋅ 00/14

- For a read job for single variables, the pointer is to be interpreted differently, depending on the

element size:

- Bit or semaphore:

The pointer is the address of a byte, the bit will be written to bit number 0, the whole

byte will be overwritten.

- Byte, left byte, right byte:

The pointer is the address of a byte. The byte will be written to the storage cell.

- Word:

The pointer is the address of a word. High and low-byte will be interchanged during

transmission.

- Doubleword/extended word:

The pointer is the address of a exetended word, the order of all 4 bytes will be

interchanged and be written to the extended word.

- For a read job for a data block, the pointer is to be interpreted differently, depending on the

element size:

-Byte:

The pointer is the address of a block of bytes, the individual bytes will be transmitted

unchanged from the PC.

- Word:

The pointer is the address of a block of words. High and low byte will be interchanged

for every individual word during transmission.

- Doubleword/extended word:

The pointer is the address of a block of exetended words. All 4 bytes of every individual

exetended word will be interchanged during transmission.

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Digital Watchdog x39 Manuel de service Page 154