Honeywell HC900 - Figure 25 DC Function Block Example

Function Blocks
DC Device Control Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 125
2/07
Properties Group Parameter Index # Parameter Description Value or Selection
Feedback
Delay Time
(sec)
3
Feedback-Fail-Delay: if during
this time-period there is no
feedback from a device
confirming the control is in the
Running state, then the block
enters the FAIL state and Out is
turned OFF.
If a device sends feedback during
this time-period, then this timer is
reset.
This parameter is configurable
from the Operator Interface.
Range: 0 – 99999
seconds (default 0)
Automatic
Reset
(Click on Box
to turn ON)
0
if set to AUTO, then the block will
reset itself after the failure (Fail
input) turns off.
If set to MANUAL, a Reset
(signal input or from the Operator
Interface station) is required to
remove the failure condition.
This parameter is determined
when the block is configured.
ON = Automatic Reset
(box selected)
OFF = Manual Reset
(box deselected)
Example
HFigure 25 shows a Function Block Diagram using a Device Control function block to control a pump to fill
a tank.
O
O
Tank Level Input
Tank Level SP
Pump Output Control
Reset
Tank Overflow
Pump Overheat Signal
Pump Running Signal
Figure 25 DC function block example