Honeywell HC900 Reference Guide

Function Blocks
UPDN Up/Down Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 427
2/07
Configuration parameters
Table 126 Up/down configuration parameters
Properties Group Parameter Index # Parameter Description Value or Selection
Presets
Local
Preset
0 Local Preset 1 to 99999
Use Remote Preset
1 On selects remote preset Click on Box to select
Example
HFigure 118 shows a Function Block Diagram using a UPDN function block. This example uses a Totalizer
function block as a retentive timer. If a fixed input of 1 is provided to the block using a Numeric Constant,
the totalizer will time up to 1 at the input rate selected (per sec, per min., per hr, or per day). For example,
if the “per hr” rate were selected, the output would be 1.0 after 1 hour, 2.0 after 2 hours, etc, up to the
Preset value.
A counter is shown to count the number of pump cycles (On to OFF transitions).
The P4-RESET Digital Variable is used to reset the timer and counter
Figure 118 UPDN function block example

Honeywell HC900 Specifications

General

Series	HC900
Redundancy	Optional
Programming Language	Function Block Diagram, Ladder Logic, Structured Text
Inputs	Analog, Digital
Outputs	Analog, Digital, Relay
Display	Optional
Control	PID, Advanced Control
Power Supply	24V DC or 100-240V AC
Storage Temperature	-40°C to 85°C
Humidity	5% to 95% non-condensing
Communication Protocols	Modbus, Ethernet