Watlow F4T Install & Troubleshooting
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Chapter 8 Appendix
Number of Function Blocks by Ordering Option
Function Block
Basic
Set 1
Set 2
Alarm
6
8
14
Compare
None
4
16
Counter
None
4
16
Linearization
4
4
8
Logic
None
12
24
Math
None
12
24
Process Value
4
4
8
Special Output
Function
None
2
4
Timer
None
6
16
Variable
4
12
24
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Compare 16 total
Off, greater than, less than, equal, not equal, greater than or equal, less than or equal
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Counter 16 total
Counts up or down loads, predetermined value on load signal. Output is active when
count value equals predetermined target value
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Logic 24 total
Off, and, nand, or, nor, equal, not equal, Latch
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Linearization 8 total
Interpolated or stepped relationship
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Math 24 total
Off, average, process scale, deviation scale, differential (subtraction), ratio (divide),
add, multiply, absolute difference, min., max., square root, sample and hold
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Process Value 8 total
Off, sensor backup, average, crossover, wet/dry bulb, switch over, differential (subtrac-
tion), ratio (divide), add, multiply, absolute difference, min., max., square root
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Special Output Function 4 total
- Compressor
turns on-off compressor for one or two loops (cool and dehumidify with
single compressor)
- Motorized Valve
turns on-off motor open/closed outputs to cause valve to represent
desired power level
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Sequencer
turns on-off up to four outputs to distribute a single power across all outputs
with linear and progressive load wearing
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Timer 16 total
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On Pulse
produces output of fixed time on active edge of timer run signal
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Delay
output is a delayed start of timer run, off at same time
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One Shot
oven timer
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Retentive
measures timer run signal, output on when accumulated time exceeds target
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Variable 24 total
User value for digital or analog variable
