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/Latch combination 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).
Lock counter value via a positive/negative edge at the gate/latch combination input (Enable pos./neg. gate)
- The level at the gate/latch combination 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 combination input is deactivated to disable the counter. It can still be used as external latch input for storage. - 1: Enable pos. gate
The counter value is locked with HIGH level at the gate/latch combination input. - 2: Enable neg. gate
The counter value is locked with LOW level at the gate/latch combination input - The current level at the gate/latch combination input is displayed via process record 0x60n0:0C "Status of input gate".
Locking the counter value via a PLC variable (Set software gate)
The counter value can be locked from the PLC application.
 | Activation of gate and latch functions via the same edge at the gate/latch input When the gate function and a latch function is activated via the same edge at the gate/latch input, the latch function is always executed first, after which the counter value is disabled via the gate function. Example: Index 0x80n0:04 "Gate polarity" (1 = "Enable pos. gate") and index 0x80n0:02 "Enable extern reset" = 1 with 0x80n0:10 "Extern reset polarity" = 1 (reset on positive edge at the gate/latch input) With a positive edge at the gate/latch input the current counter value is first set to zero (reset). 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 0x80n0:02 "Enable extern reset" with 0x80n0:10 "Extern reset polarity" = 0 (reset on negative edge at the gate/latch input). |