Latches
SR Persistent Latch
Description This function block has both a Set and Reset function for the Output.

When the Reset is Enabled, the Output is forced LOW.
When the Set is Enabled, the Output is forced HIGH.
Order of Precedence: Reset => Set.

The Output is persistent (stored) when powered-down.
Availability
  • Available only in the dw2xx & dw2xx-v2 series products
  • Requires library: Process Control (option -05)
  • Firmware versions 0x202A and later
savvy-SFD Graphic srPersistentLatch
Graphic with Parameters srPersistentLatch

Parameters

Set Input, Read-write, Set to default on hard initialization, Boolean (signed 16-bit integer)

The Output goes High and remains that way after the rising edge of the Set parameter, until the Reset parameter is active.
0 = Inactive
1 = Set
Reset Input, Read-write, Boolean (signed 16-bit integer)

The Reset input predominates. The Output is always Low when Reset is active.
0 = Inactive
1 = Reset
Output Output, Read-only, Boolean (signed 16-bit integer)

Latches High following a Set input, until Reset is active.
0 = Low
1 = High