Automatic control function programming manual ladder language

Structure of the transmission Buffer
@ Buffer start address
Written
by the user
programme
15 - 30 en-938846/7
Buffer size
(not significant)
Request size
(1 word)
Request
(see Sec. 15.3)
1 word
128 bytes
max.
Programming error causing a CPU fault
Access to a prohibited address:
- &datagram parameter error,
- &datagram+size outside authorised area.
15.4.2 Read an Answer uniti
Syntax
uniti (source_port, &datagram)
source_port: Number of the source port.
&datagram: Address of the memory block which will receive the request.
Description
The uniti function works on ports 0x30 to 0x3F and 0x10 to 0x17.
This function:
- Receives the answer to a request previously sent by unito() on the same source port
- Receives an «unsolicited» request sent by the part programme of an axis group. In this case, the source port
indicates the axis group from which the message is to be received (0x10 to 0x17).
REMARKS If the return code is 0x06, the uniti() function must be called periodically until the
message is received.