Pilz PIT m3.2p machine tools pictogram - Manual (Page 31)

Function description
Operating Manual PIT m3.2p
1003176­EN­02 31
4.3.2.2 Handshake­controlled communication mode
With handshake­controlled communication mode, the download of the Key ID number is
started by the control system (Request).
Features of this communication mode:
} Download starts via a request to the control system, once the transponder key is con­
nected
} Download is repeated by a renewed request to the control system
} Variable bit rate (min. 2 PLC cycles per bit)
} Download on 1 data line
} Typical download time: 28 Bit * (20 ms + 4 * PLC cycle)
} Identifier for ID end for feasibility check
} Input/outputs required on the control system: 3 inputs and 1 output
The Key ID interface must be coded with a jumper between IDo3 and IDi1 in order to down­
load the Key ID number of a transponder key to the control system in handshake­controlled
communication mode. The terminals on the Key ID interface are used as follows:
Key ID interface
Brief description of applic­
ation
Coding via jumpers
IDo0 IDsync
IDi1 Coding: IN
IDo3 Coding: OUT
IDo1 IDresponse
IDo2 IDdata
IDo3 Coding: OUT
IDi0 IDrequest
IDi1 Coding: IN
In handshake­controlled communication mode, the operating mode selector switch can be
operated in a functional variant. In this case the Key ID number of the transponder key is
not downloaded to the control system. The control system is only used to evaluate IDo0 on
the Key ID interface. In this case IDo0 is used as a signal output, enabling the control sys­
tem to recognise whether the transponder key is valid/invalid. With this functional variant,
only 1 input is required on the control system. The unused terminals on the Key ID interface
(IDo1, IDo2 and IDi0) may remain unwired ("open").