Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 27

DRT2 Features
Top/Valley Hold (Input
Units Only)
Rate of Change (Input
Units Only)
Comparator (Input Units
Only)
Off-wire Detection (Input
Units Only)
User Adjustment
Cumulative Counter
Communications Error
Output (Output Units
Only)
Top/Valley Count Function
Temperature Range
Timing Function
Input Temperature
Variation Detection
Function
6
be compared with alarm set values, and flags turned ON as appropriate to
indicate the status (comparator function).
The top and valley values for values input to Analog Input Terminals and Tem-
perature Input Terminals can be held. The timing of tops and valleys can be
monitored with the Top/Valley Detection Timing Flags. The top and valley val-
ues can be compared with alarm set values, and flags turned ON as appropri-
ate to indicate the status (comparator function).
The rate of change for values input to Analog Input Terminals and Tempera-
ture Input Terminals can be obtained for each sampling cycle.
Values input to Analog Input Terminals and Temperature Input Terminals or
values after math processing can be compared to the alarm set values (HH,
H, L, and LL), and the result indicated with the Analog Status Flags. If the
result is outside the set range, the Normal Flag (pass signal) is turned ON.
With Analog Input Terminals, disconnections can be detected in wiring for
analog (voltage or current) inputs that are enabled as AD conversion points.
The status can be checked at the Master using the Off-wire Detection Flag.
This function is valid only for the input ranges 4 to 20 mA and 1 to 5 V.
With Temperature Input Terminals, disconnections can be detected for each
sensor input. The status can be checked at the Master using the Off-wire
Detection Flag.
Input (or output) can be adjusted to compensate for errors in the input (or out-
put) voltage or current resulting from the characteristics or connection meth-
ods of the input (or output) device. Compensation is performed by applying
linear conversion based on the points corresponding to 0% and 100%.
A cumulated value that approximates the integral of analog input (or output)
values or a temperature input value over time can be calculated and read.
Monitor values can also be set in the Unit. When the cumulated count value
exceeds the set monitor value, the Cumulative Counter Flag in the area for
Generic Status Flags turns ON.
The values output by Output Units when errors occur can be set for each out-
put.
The number of times the top or valley value is reached can be counted for an
application that has fixed cycles of temperature changes. Explicit messages
can be used to see if the number of times that is counted has exceeded a
monitoring set value.
The length of time that the system is at a user-set temperature or within a
user-set temperature range can be measured in seconds. Explicit messages
can be used to see if the measured time has exceeded a monitoring set value.
A relative comparison can be made between two inputs (0 to 3) and to detect
temperature differences between two inputs or with a monitoring set value.
Explicit messages can be used to see if the temperature difference has
exceeded a monitoring set value.
Section 1-1