Det-Tronics S3 Graphics - Manual (Page 296)

13-71 EQP LOGIC EDITOR
Version 6.0
Item 30 - Gas Mode
Gas Mode is used to determine if static logic should activate high and low gas alarms. When mode 1 is selected
static logic will activate the controller gas alarms. Mode 2 should be used for non-gas detector inputs.
Gas Mode
Value Definition
1 Gas Detector
2 Other (Non Gas)
Item 31 - Engineering Zero Value
Zero range corresponds to the 4 ma value on the sensor input. For example, if 4 ma equates to 10.0 MPH of air
flow the engineering zero value should be set to 10.0.
Item 32 - Engineering Full Scale Value
Full scale range corresponds to the 20 ma value on the sensor input. For example, if 20 ma equates to 900.0
MPH of air flow the engineering zero value should be set to 900.0.
Item 33 - Calibration Level
This variable determines the calibration point for the 4 to 20 ma input. Valid values are in the range of 20 to 100%
of full scale.
Item 34 - Low Alarm Setpoint
Alarm setpoints must be within the limits listed on the DCU type code table. Alarm determination is done at the
DCU not the controller. However, user logic could be created within the controller to allow for many more alarm
levels.
Item 35 - High Alarm Setpoint
Alarm setpoints must be within the limits listed on the DCU type code table. Alarm determination is done at the
DCU not the controller. However, user logic could be created within the controller to allow for many more alarm
levels.
Item 36 - Units Text
This field holds the engineering units as a text string. The text string shall be displayed with the process variable
on the faceplate display. Future versions of DCUs with on board displays may also utilize this information for
display.
Item 37 - PV Change Dead-band
The process variable dead-band can be adjusted with this variable. This is only used during “Online” operation
and is expressed as a percentage of full scale. When the host computer instructs the controller to operate in online
mode the controller sends exception messages to the host computer when device variables change. However,
many analog values are constantly changing which many cause an abundance of unneeded messages. The “PV
Change Dead-band” variable is provided to limit how often the value is sent. The value must change by the “PV
Change Dead-band” amount or more fro the value to be sent.
DEVICE ITEM NUMBER DESCRIPTIONS DEVICE ITEM NUMBER DESCRIPTIONS