BECKHOFF KL5101-0000 - Manual (Page 14)

Terminal configuration
12 KL5101
3.3.2 Status byte in process data transfer
The status byte is transferred from the terminal to the controller. The status
byte contains various status bits of the KL5101.
Bit
7 6 5 4 3 2 1 0
Name REG=0 - State_Input Overflow Underflow CntSet_Acc Latch_Ext_Val/
RD_Period_Q
Latch_Val
Bit Name
5 State_Input The state of the Status input is mapped in this Bit
(adjustable via feature register)
4 Overflow This bit is set if an overflow (65535 to 0) of the 16-bit
counter occurs. It is reset when the counter exceeds a
third of the measurement range (21845 to 21846) or
as soon as an underflow occurs.
3 Underflow This bit is set if an underflow (0 to 65535) of the 16-bit
counter occurs. It is reset when the counter drops
below two thirds of the measurement range (43690 to
43689) or as soon as an overflow occurs.
2 CntSet_Acc The data for setting the counter has been accepted by
the terminal.
1 RD_Period_Q The data bytes 2, 3, 4 contain the period time
Latch_Ext_Val An external latch pulse has occurred. The data D2,D3
in the process image corresponds to the latched value
when the bit is set. To activate the latch input again,
En_Latch_Ext must first be removed and then set
again.
0 Latch_Val A zero point latch has occurred. The data D2, D3 in
the process image corresponds to the latched value
when the bit is set. To activate the latch input again,
En_Latch must first be removed and then set again.