Figure 2-53 Pt Function Block Example - Honeywell UMC800 Reference Manual

2.51 PT Function Block,
Configuration Parameters, continued
Table 2-45 PT Function Block Configuration Parameters, continued
Properties Group Parameter
Start
Cycle
Example
Figure 2-53 shows a Function Block Diagram using a PT function block
An OFF delay timer block output is ON as long as the RST input is logic HI (ON). It can be used for time
duration but must be triggered by an ON to OFF transition on the Reset input. This can be accomplished
using Trigger blocks (TRIG) to create one-shot pulses which last one scan cycle. The fast logic trigger
pulse will last 100 ms. while the normal logic trigger pulse will last the complete scan cycle for analog
blocks. Use according to application need. A Periodic Timer (PT) output pulse may also be used to start
the timer for the OFF delay for time duration.
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continued
Index#
N/A
Hour
Minute N/A
N/A
Second
N/A
Day
N/A
Hour
N/A
Minute
N/A
Second

Figure 2-53 PT Function Block Example

Function Block Reference Guide
Parameter Description
Start Hour
Start Minute
Start Second
Start Day
Cycle Hour
Cycle Minutes
Cycle Seconds
Function Blocks
Value or Selection
0 through 23
0 through 59
0 through 59
Monthly - 1 - 31
(Days >31 = 31)
If the current month's
last day is less than 31
it will turn ON on the
last day of the month.
Weekly -Monday
through Sunday
0 through 23
0 through 59
0 through 59
Timing Diagram
AND4 output
TRIG1 output
Off delay
OFDT2 output
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