Basic Function Principles
Four-channel linear path control can be implemented with the KL5121 Bus Terminal. For this purpose the terminal reads in the incremental signal (which is either supplied by an encoder or by a pulse generator), obtains the position of the workpiece from another input (latch), and switches on the outputs at defined counter states which have previously been stored in the form of a table. Automatic speed correction is carried out separately for each channel (adjustable by means of registers in the terminal). The workpiece’s encoder edge can be configured, so that positive edges, negative edges or both may be used. The switching times for the individual output channels are < 100 µS. A maximum of 60 switching values can be entered, and the number for each channel can vary from 0 to 60. The counter is limited to 16 bits, and tracking the workpieces is not possible.
LED display
The signal LEDs indicate the state of the encoder inputs A and B, the latch and gate logic inputs and of the four outputs O1, O2, O3 and O4.
Connections
The KL5121 has 4 logical 24 V inputs and 4 logical 24 V outputs, as well as 8 contacts for the 24 VDC supply of external devices.
- A, B: sensor inputs (incremental encoder or pulse generator)
- Latch (workpiece encoder input): the latch input recognizes the workpiece, with the result that the 16 bit counter is set to zero when the latch input is activated. The latch input can be configured by way of the feature register.
- Gate (enable input): the gate enables the latch input. The gate input can be configured by way of the feature register.
- O1, O2, O3, O4: 24 V switch outputs
- 24 V/0 V: 24 VDC supply voltage for the external devices (e.g. encoder)
Operation modes
Set by the control byte:
- linear path control with 4 output channels
- Alternative: PWM type of output with pre-set on and off times (nozzle test)
Process data
The KL5121 always occupies 6 bytes of input data and 6 bytes of output data.
The control/status byte is located at the lowest byte offset.
There are two logical data channels:
- Data channel 0
for enabling the output functions and for reading the status information. - Data channel 1
for transferring the switch values to the output table of the terminal.