Pilz PIT m3.2p machine tools pictogram - Manual (Page 35)

Function description
Operating Manual PIT m3.2p
1003176­EN­02 35
4.3.3.2 Evaluation of the Key ID number with handshake­controlled communication
IDo0
(IDsync)
Bit 27 Bit 25 … Bit 02 Bit 01 Bit 00
IDo2
(IDdata) Bit 26
t
V
[b]
[c]
[d]
[f]
t
h
t
en
IDo1
(IDresponse)
IDi0
(IDrequest)
[e] [a]
t
a
t
IDend
200 ms
[g]
Fig.: Timing diagram for handshake­controlled signal download
Legend:
The additional terminal designations (IDsync, IDresponse, IDdata and IDrequest etc.) are
abbreviations for the terminal signal's application.
IDo0 Control line
The signal is generated by the operating mode selector switch.
"0" signal No transponder key is connected or the transponder key that is con­
nected is invalid. The control system cannot request the Key ID
number.
"1" signal A valid transponder key is connected and the control system can re­
quest the Key ID number.
IDo1 Handshake line (Response)
The signal is generated by the operating mode selector switch and indicates
whether a data bit at IDo2 is valid/invalid.
"0" signal The data bit at IDo2 is invalid and may not be evaluated.
"1" signal The data bit at IDo2 is valid and may be evaluated.
IDo2 Data line for downloading the Key ID number
The Key ID number (28 Bit) is generated by the operating mode selector switch.
The download begins with MSB (Bit27 … Bit00).
IDi0 Handshake line (Request)
The signal is generated by the control system.
"0" signal No bit is requested at IDo2
"1" signal A new bit is requested at IDo2.
t
en
IDsync Enable Time (min. 0 ms)
t
v
Data Output Valid Time (max. 10 ms)
t
h
Data Output Hold Time (min. 0 ms)
t
a
Data Output Access Time (max. 10 ms)
t
IDend
End of Key ID Number Transfer (200 ms)
After the last falling edge at IDi0, the operating mode selector switch still has a
"1" signal at output IDo1 for 200 ms. In this way, the end of the Key ID number
and therefore the end of the download (End of Key ID Number Transfer) is dis­
played. This can be used for the feasibility check.