Honeywell HC900 Reference Guide

Function Blocks
TMDT Time and Date Function Block
402 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
TMDT Time and Date Function Block
Description
The
TMDT label stands for Time and Date. This block is part of the Counters/Timers category.
Function
Controls change between Daylight Saving and Standard time. Indicates when controller time is in Daylight
Saving. If the controller is using a network time server, indicates if the connection to server has failed.
Inputs
DSTI
– When ON the controller will be in Daylight Saving time. When OFF the controller will be in
Standard time. Use of this pin requires configuring the controller time to use DSTI.
Outputs
DSTO
– ON when controller is in Daylight Saving time. OFF when controller is in Standard time. To set
up Daylight Saving time, see Set Controller Time in HC Designer configuration software.
NTFAIL – ON when connection to network time server has failed. Note: controller’s time is synchronized
to the time server every few hours, therefore this pin can take a few hours to detect the failure.
Block Properties
Configurable Parameters
Table 115 Time and Date configuration parameters
Properties Group Parameter Index # Parameter Description
Value or
Selection
Block Order
N/A Execution Order for Block Read Only. To
change block
order, right-
click on a
Function Block
and select
Execution
Order.

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