Pilz PIT m3.2p machine tools pictogram - Manual (Page 33)

Function description
Operating Manual PIT m3.2p
1003176­EN­02 33
Download procedure
[a] The operating mode selector switch sets the signal at IDo0 (IDsync: control
line) to "1" for 100 ms, thereby signalling to the control system that transmis­
sion has started.
[b] A rising edge at IDo1 (IDclock: test pulse line) indicates that the data at data
lines IDo2 and IDo3 is present and valid and can be read by the control sys­
tem.
[c] By the time there is a falling edge at IDo1 (IDclock: test pulse line), the control
system must have sent the previously read bit back to the operating mode se­
lector switch via the data lines IDi0 and IDi1.
[d] Before the rising edge at IDo1 (IDclock: test pulse line), the operating mode
selector switch reads the bits sent back to IDi0 and IDi1 by the control system
and checks it for equivalence.
[e] At least 60 ms after the falling edge at IDo1 (IDclock: test pulse line), the last
bit sent back by the control system must be present at data lines IDi0 and
IDi1.
[f] A maximum of 100 ms after the falling edge at IDo1 (IDclock: test pulse line),
the last bit sent back by the control system must be present at data lines IDi0
and IDi1; in other words, by this point at the latest, data transfer must be com­
pleted and the data lines must have a "0" signal.
INFORMATION
If the control system does not feed back the previously read Bits correctly,
the download is aborted and restarted. The "IDsync" signal is set once
again. The download is repeated until the Key ID number is downloaded
completely.
The download of the Key ID number typically takes 1.8 s.