Instruction manual

Analog Latches
132
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 will be
latched by the trigger when it falls from 1 to 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
of the latch block:
At the beginning of the latch sequence, the analog input value is 2000 when the
trigger falls from 1 to 0. The output is latched at 2000.
At the moment when the latch trigger falls from 1 to 0 the second time, the analog
input is at 2400. The output is latched at 2400.
When the latch trigger falls from 1 to 0 the third time, the analog input is at 1800. The
output is latched at 1800. On the fourth transition of the trigger from 1 to 0, 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