Gate/Latch input

The terminal provides an external Gate/Latch input for 24 V_DC signals with a minimum pulse duration of t_ON > 1 µs. This can be used as follows:

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 0x8000:04 "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 0x6000:0C "Status of input gate".

Save counter value via a positive/negative edge at the Gate/Latch input (Enable latch extern 2 on positive/negative edge)

The Gate/Latch input may be used as a second latch input (Latch extern 2). To do this, the gate should be disabled.

Deactivation of the gate Set the "Gate polarity" bit (index 0x8000:04) to "0 – Disable gate" in order to be able to use the Latch extern 2 input without disabling the counter value after the latch event.

• The counter value at the Latch extern 2 input can be saved via:
• Index 0x7000:0C "Enable latch extern 2 on positive edge" = TRUE
  At the first external latch pulse with positive edge at the Gate/Latch input the current counter value is stored in index 0x6000:22 "Latch value 2".
• Index 0x7000:0D "Enable latch extern 2 on negative edge" = TRUE
  At the first external pulse with negative edge at the Gate/Latch input the current counter value is stored in index 0x6000:22 "Latch value 2".
• Simultaneous activation of 0x7000:0C and 0x7000:0D
  On the first pulse at the Gate/Latch input, regardless of the polarity of the edge, the current counter value is stored in index 0x6000:22 "Latch value 2".
• Specification whether it is necessary to reactivate the command to save the counter value via:
• "Enable continuous latch extern 2" Index 0x8000:23 = FALSE
  The following pulses at the Gate/Latch input have no influence on the Latch value in index 0x6000:22 "Latch value 2" if the bit in index 0x7000:0C or 0x7000:0D is set.
  Only when index 0x6002:12 "Latch extern 2 valid" is FALSE, a new counter value can be written to the Gate/Latch input in index 0x6000:22 "Latch value 2".
• "Enable continuous latch extern 2" index 0x8000:23 = TRUE
  The counter value is written to index 0x6002:12 "Latch value 2" for each parameterized edge at the Gate/Latch input.
  There is no need to reactivate index 0x7000:0C or 0x7000:0D.
• The status of the Gate/Latch input can be recorded via index 0x6000:0C "Status of input gate".
• Saving of the counter value in index 0x6000:22 "Latch value 2" is confirmed via bit 0x6002:12 "Latch extern 2 valid".