BECKHOFF KL1501 - Manual (Page 6)

Product Overview
4 KL1501
2.2 Functional Description
The input terminal KL1501 counts binary pulses and transmits the current
value to the higher-level control system. In addition to the 32-bit up/down
counter, a 32 bit gated counter or two 16 bit counters are available as
operating modes. In the gated counter mode, a low level or high level at
the gate input suppresses the terminal’s counting function. If two 16 bit
counters are active, the U/D input is the clock input for the second counter.
Two digital outputs can also be set.
The maximum input frequency is limited to 100 kHz. The minimum pulse
width of the input signal is approximately 1 microsecond. The counters
react to the rising edge of the input signal.
Via the control byte, from the control system the counter status can be set,
the terminal’s counting function can be suppressed and the outputs can be
activated. An internal function can also be activated to enable automatic
setting of the outputs at defined counter statuses.
LED display The LEDs indicate the states of the U/D and CLOCK inputs as well as the
states of the outputs OUT1 and OUT2.
Process data
Standard output format When using the standard output format, 5 bytes (4 bytes of user
information data and 1 control/status byte) are mapped. The process data
differs depending on the set function:
•
Gated counter:
32 bit unsigned integer
•
Up/down counter:
32 bit signed integer
•
Two active counters:
2 x 16 bit unsigned integer
Mapping of the terminal in the standard format is described in further detail
in the appendix.
Alternative output format If the alternative output format is chosen, pay attention to the fact that the
output length (4 bytes or 6 bytes instead of 5 bytes) and mapping of the
terminal are changed.
•
Up/down counter:
24 bit signed integer
•
Gated counter:
24 bit signed integer
•
Two active counters:
1 x 8 bit counter0 and 1 x 16-bit counter1