Commissioning
EL5101, EL5101-0010, EL5101-0011
122
Version: 4.2
Fig. 151: Frequency measurement principle in normal operation mode
Period calculation
• This calculation is carried out in the slave without reference to the distributed clocks system. It is
therefore independent of the DC mode.
• In each cycle the interval between 2 positive edges of input A is counted with a resolution of 100 ns.
• If no edge change occurs for approx. 1.6 s, any period specification is cancelled.
Note
Frequency and period measurement
From the explanatory notes above it is apparent that the frequency measurement can mea-
sure the current axis status (velocity) significantly more accurately than the period mea-
surement. Frequency measurement is therefore preferable, if possible.
Latch
• Latch control is implemented via the
control and status word [
}
128]
.
Register Reload
• If Register Reload is enabled in CoE object
0x8000:01 [
}
124]
, the counter value is set to zero in the
event of overflow over the value in CoE object
0x8001:02 [
}
124]
and to the value in CoE object
0x8001:02 [
}
124]
in the event of underflow below 0.
Index Reset
• If Index Reset is enabled in CoE object
0x8000:02 [
}
124]
, input C resets the counter to 0.
Note
“Register Reload” and “Index Reset”
“Register Reload” and “Index Reset” cannot be operated simultaneously.
FWD Cnt
• If FwdCnt is activated in CoE object
0x8000:03 [
}
124]
, the EL5101 operates as counter on channel A.
Channel B indicates the counting direction: B=TRUE forward, B=FALSE backward. The counter can be
locked via the gate input (24 V).
- CoE object
0x8000:04 [
}
124]
(TRUE): Locking of the counter at the gate input with positive edge (0 V
-> + 24 V).
- CoE object
0x8000:05 [
}
124]
(TRUE): Locking of the counter at the gate input with negative edge (+
24 V -> + 0 V).
