Instruction manual

Analog Latches
144
890USE18300 September 2003
Analog Input The analog input may be an unsigned integer value in the range 0 to 65 535 or a
signed integer value in the range -32 768 to +32 767. The value of the input is
latched when the latch trigger is 1 and unlatched when the latch trigger is 0.
The input value may be produced by:
an analog input from a module on the island
an analog output from the virtual module (See The Virtual Module, p. 28)
The following timing diagram shows how the value of the trigger effects the output
from the block:
At the beginning of the timing sequence, the analog input is at a value of 2000 when
the trigger rises from 0 to 1. The output of the action is latched at 2000.
At the moment when the latch trigger rises from 0 to 1 the second time, the analog
input is at 2400. The output is then latched at 2400.
When the latch trigger rises from 0 to 1 the third time, the analog input is at 1800.
The output is latched at 1800. On the fourth transition of the trigger from 0 to 1, the
analog input is at 900. The output is then latched to 900.
analog input
latch_trigger
0
output
1
2000
2400
1800
900
2000
2400
1800
900