Honeywell HC900 Reference Manual page 421

Configuration parameters
Properties Group
Address
Range
Cycle Settings
Example
F igure 115 shows a Function Block Diagram using a TPO function block. Time Proportioning outputs are
H
commonly used for electrically heated applications where regulating the amount of ON time vs. OFF time
of a heater is used to control temperature. In the example the TPO output is used to activate a relay output
to control a heater.
Revision 11
2/07
Table 117 TPO configuration parameters
Parameter Index #
0
Rack
I/O Module
Channel
1
Range Hi
2
Range Lo
N/A
Cycle Time
4
Min Off
Time
5
Min On
Time
*For HC900 controller's 32 Channel DO Module, outputs 17 through 32 may not be used
for TPO (Time Proportioning Output), PPO (Position Proportioning Output) or TPSC (Three
Position Step Output) output types.
HC900 Hybrid Control Designer Function Block Reference Guide
TPO Time Proportional Output Function Block
Parameter Description
Address of selected Rack
Address of selected I/O module
Channel on selected I/O Module
High Range Value
Low Range Value
Output Cycle Time
Minimum OFF time
Minimum ON time
Function Blocks
Value or Selection
Enter a value:
from 1 to 5
Enter a value:
from 1 to 16
Enter a value:
from 1 to 16*
–9999 to 9999
Default = 100
–9999 to 9999
Default = 0
1 to 120 seconds
Default = 20
to 15.0 seconds
Default = 0.0
to 15.0 seconds
Default = 0.0
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