Do-more H2 Series PLC User Manual, 1st Edition, Rev. F - H2-DM-M
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Chapter 6: Specifications - Analog I/O Modules
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F2-8AD4DA-2 Analog Input/Output - continued
Input Track and Hold Selection (WYn+6)
The track and hold feature for each of the eight inputs can be individually configured for
minimum, maximum, no hold, or reset held value with memory address WYn+6 (WYn: Starting
WY address assigned to this module). This configuration can be changed “on the fly” while
the program is running. Two (2) bits in this memory address are assigned to each analog input
channel.
The HEX data format is used to set up the track and hold option as seen in the following
example.
Example: An F2-8AD4DA-2 is installed in slot 0 and WY6 is used for the track and hold
selection. Input channel track and hold settings: ch 1-3 = none, ch 4-5 = minimum, ch 6-7 =
maximum, ch 8 = reset. In this case, 0xE940 needs to be written into WY6.
Use the MOVE instruction to write the Hex value 0xE940 into WY6.
Channel Track and Hold Selection Table
Track and Hold
Select
TnH
(Track and Hold
channel n High bit)
TnL
(Track and Hold
channel n Low bit)
Result
No Track and Hold
0
0
Returns real time input value
Track and Hold
Minimum Value
0
1
Maintains lowest measured
value
Track and Hold
Maximum Value
1
0
Maintains highest measured
value
Reset Track and
Hold Value
1
1
Resets previously held input
value
