Lock counter value
The “Latch” and “Gate” inputs each combine gate and latch functions in a single input and are therefore referred to below as gate/latch combination inputs.
The gate function enables locking of the counter “Counter value” (0x60n0:11).
The counter is locked at the first pulse at the gate/latch combination 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 or negative edge at the gate/latch combination input (index 0x80n0:04 “Gate polarity” = “Enable pos./neg. gate”),
- PLC variable: The counter can be locked from the PLC application (output process data “Set software gate”).
The gate/latch combination input may be used as a second latch input “Latch extern 2”.
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 disabled to lock 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 the input process data “Status of input gate” (0x60n0:0C).
 | Activation of gate and latch functions via the same edge at the gate/latch combination input in 2-channel mode 2xAB When the gate function and a latch function is activated via the same edge at the gate/latch combination input, the latch function is always executed first, after which the counter value is locked 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 a positive edge at the gate/latch combination input) With a positive edge at the gate/latch combination input the current counter value is first set to zero (reset). After that, the counter value is locked. The same applies to the use of index 0x80n0:04 “Gate polarity” (2 = “Enable neg. gate”) and the simultaneous activation of index 0x80n0:02 “Enable extern reset” with 0x80n0:10 “Extern reset polarity” = 0 (reset on a negative edge at the gate/latch combination input). |
Lock counter value via a PLC variable (Set software gate)
The counter value can be locked from the PLC application.