Table 2-33 Off Delay Timer Configuration Parameters; Figure 2-41 Ofdt Function Block Example - Honeywell UMC800 Reference Manual

2.44 OFDT Function Block,
Properties Group Parameter
Time Delay Time delay
Example
Figure 2-41 shows a Function Block Diagram using an OFDT 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 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 output pulse may also be used to start the timer for
the OFF delay.
3/99
continued

Table 2-33 OFF Delay Timer Configuration Parameters

Index#
0

Figure 2-41 OFDT Function Block Example

Function Block Reference Guide
Parameter Description
Delay Time - specifies the
amount of time the OFF state
logic output will occur after an
ON to OFF transition of the
Reset input.
Function Blocks
Value or Selection
0.1 sec, 0 to 9999.9
Enter as 0.1 to 99999 in
0.1 increments
Timing Diagram
AND4 output
TRIG1 output
Off delay
OFDT2 output
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