24 WIKA operating instructions pressure switch model PSA-31
GB
14018458.01 11/2011 GB/D/F/E
6. Commissioning, operation
6.9 Description of the IO-Link functionality (optional)
IO-Link is a point-to-point connection for the communication of the PSA-31 with an IO-Link master.
Physical layer
The PSA-31 supports the following features:
IO-Link specication: Version 1.0
SIO mode: Yes
Minimum cycle time: 2.3 ms
Rate: COM2 (38.4 kBaud)
Process data length: 16 bit (Frametype 2.2)
Process data
The PSA-31 has 1 or 2 digital outputs. Both switching outputs are transmitted as process data over the
IO-Link.
In the 'SIO Mode' (standard I/O mode), i.e. no IO-Link operation, the switching output 1 will switch on
pin 4 of the M12 connector.
In the IO-Link communication mode, this pin is reserved exclusively for communication. Switching
output 2 is always switched in addition on pin 2 of the M12 connector.
With a Frametype 2.2, the 16-bit process data from the pressure switch are transmitted cyclically. Bit 0
is the state of switching output 1 and bit 1 is the state of switching output 2. Where 1 and DC 24 V
correspond to the "closed" logic state of the respective output.
The remaining 14 bits contain the analogue value measured by the pressure switch. The start of the
measuring range (MBA) corresponds to a value of 1,000 d and the end of the measuring range (MBE)
corresponds to a value of 9,000 d.
Bit Process value Value range
0 OU1 0 = o, 1 = on
1 OU2 0 = o, 1 = on
2 … 15 Measured value (integer) 1,000 d = MBA
9,000 d = MBE
To Next Page
