Lock counter value
The gate function enables locking of the counter (0x60n0:11).
The counter is locked at the first pulse at the Gate/Latch input. Subsequent pulses have no influence on the counter value. This allows a timeframe to be defined in which counting signals are acquired. The gate function can be triggered by:
- Gate input: a positive / negative edge at the Gate/Latch input (Enable pos./neg. gate),
- PLC variable: the counter can be locked from the PLC application (Set software gate).
The Gate/Latch input may be used as a second latch input (Latch external 2).
Lock counter value via a positive/negative edge at the gate input (Enable pos./neg. gate)
- The level at the Gate input at which the counter value is locked during runtime can be specified via index 0x80n0:04 "Gate polarity".
- 0: Disable gate
The Gate/Latch input is disabled. It can still be used as Latch extern 2 input. - 1: Enable pos. gate
The counter value is locked with HIGH level at the Gate/Latch input. - 2: Enable neg. gate
The counter value is locked with LOW level at the Gate/Latch input. - The current level at the Gate input is displayed via process data 0x60n0:0C "Status of input gate".
 | Simultaneous use of Gate und Latch extern 2 When using index 0x80n0:04 "Gate polarity" (1 = "Enable pos. gate") and simultaneously activating index 0x70n0:0C "Enable latch extern 2 on positive edge", the current counter value is initially stored in index 0x60n0:22 "Latch value 2" when a positive edge is detected at the Gate/Latch input. The counter value is then blocked. The same applies to the use of index 0x80n0:04 "Gate polarity" (2 = "Enable neg. gate") and simultaneous activation of index 0x70n0:0D "Enable latch extern 2 on negative edge" at a negative edge at the Gate/Latch input. |
Locking the counter value via a PLC variable (Set software gate)
The counter value can be locked from the PLC application.