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Automatic control function programming manual ladder language

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Structure of the Reception Buffer<br />

Buffer start address<br />

written by the<br />

user programme<br />

Written by<br />

the monitor<br />

Buffer size<br />

UNITE request or answer size<br />

(1 word)<br />

Spare<br />

(1 byte)<br />

Station<br />

(1 byte)<br />

Module<br />

(1 byte)<br />

Line number<br />

(1 word)<br />

UNITE request or answer<br />

(see UNITE Protocol Manual)<br />

1 word<br />

Network<br />

(1 byte)<br />

Port<br />

(1 byte)<br />

Channel<br />

(1 byte)<br />

128 bytes<br />

max<br />

Exchanges by Protocol<br />

REMARK The Network, Station, Port, Module and Channel fields correspond to the<br />

Telemecanique Series 7 addressing identifying the request recipient. Refer to the<br />

<strong>manual</strong> on the corresponding network.<br />

Line No. Machine processor First Second Special<br />

card IT/serial line card IT/serial line card <strong>control</strong>ler<br />

UNI-TELWAY 0x20 and 0x21 0x24 to 0x27 0x28 to 0x2B<br />

MAPWAY - ETHWAY 0x30<br />

ETHERNET 0x40<br />

REMARK With UNI-TELWAY, if the answer is 2 bytes and the return code is 0xFF, the return<br />

code can have the following values:<br />

- 0x03: recipient inaccessible<br />

- 0x04: NACK: recipient buffer full<br />

- 0x0A: timeout.<br />

Programming error causing a CPU fault<br />

Access to a prohibited address:<br />

- &datagram parameter error,<br />

- &datagram+size outside authorised area.<br />

Buffer<br />

size<br />

en-938846/7 15 - 37<br />

15

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