OM-WEB Series User's Guide
Specifications
37
Temperature alarms
Table 11. Temperature alarm specifications
Parameter
Conditions
Number of alarms
8 (one per digital I/O line)
Alarm functionality
Each alarm controls its associated digital I/O line as an alarm output. The input to
each alarm may be any of the analog temperature input channels. When an alarm is
enabled, its associated I/O line is set to output and driven to the appropriate state
determined by the alarm options and input temperature. The alarm configurations are
stored in non-volatile memory and are loaded at power on.
Alarm input modes
Alarm when input temperature > T1
Alarm when input temperature > T1, reset alarm when input temperature goes
below T2
Alarm when input temperature < T1
Alarm when input temperature < T1, reset alarm when input temperature goes
above T2
Alarm when input temperature is < T1 or > T2
Note: T1 and T2 may be independently set for each alarm.
Alarm output modes
Disabled, digital I/O line may be used for normal operation
Enabled, active high output (digital I/O line goes high when alarm condition is
met)
Enabled, active low output (digital I/O line goes low when alarm condition is
met)
Alarm update rate
1 second
Memory
Table 12. Memory specifications
Parameter
Conditions
EEPROM
512 bytes for sensor configuration
FLASH
2 MB for device configuration and website storage
Microcontroller
Table 13. Microcontroller specifications
Parameter
Conditions
Type
One high-performance 8-bit RISC microcontroller (isolated)
One high-performance 16-bit RISC microcontroller (non-isolated)
Power
Table 14. Power specifications
Parameter
Conditions
Specification
Supply current (Note 16)
Continuous mode
440 mA max
External power input (Note 15)
+5 VDC ± 5%
(+5 VDC power supply provided)
External power supply (included)
Omega p/n OMB-DAQ-2416-ADAP
+5 VDC, 10 W, 5% regulation
Voltage supervisor limits
4.75 V > Vext or Vext > 5.25 V
PWR LED = Off; (power fault)
4.75 V < Vext < 5.25 V
PWR LED = On
User output voltage range
Available at +5V screw terminal
4.65 V min, 5.25 V max
User output current available
Available at +5V screw terminal
10 mA max
