ATC770 Microprocessor-Based Pressure/Process Controller 13
Alarm Outputs: 3 standard alarms (AL1, AL2 and AL3).
AL1 and AL2 Contacts: 1 SPDT 2 A max @ 240 VAC resistive load.
AL3 Contacts: 1 SPST solder jumper selectable NO/NC 2 A max @ 240 VAC resistive load.
Contact Protection: Varistor for spike protection.
Alarm Type: Each alarm is keyboard programmable for:
• Process / Deviation / Band
• High / Low / Low inhibited on start up
•Auto / Manual reset
Alarm Mask: The alarm mask may be restored using the keyboard parameter
(AL.MSK)
. Moreover
the alarm mask of deviation and band alarms is restored at set point change and during set point
ramp.
Excitation Type: Keyboard configurable for each alarm: relay coil energized in no alarm condition
(failsafe) or relay coil energized in alarm condition (non-failsafe). The default condition is failsafe.
Threshold: From 0 to 110% Full Scale (the threshold may be limited due to the selected full scale
value).
Hysteresis: Keyboard programmable for each alarm; from 0.1% to 10.0% of span or 1 Least
Significant Digit (whichever is greater) for each alarm.
Alarm Filter: Selectable from the following values: OFF, 0.4 s, 1 s, 2 5. 3 s. 4 s, 5 s.
Alarm Update Time: At every input conversion.
2.8 OPTIONAL SERIAL COMMUNICATION INTERFACE SPECIFICATION
Serial Interface: RS-485 type. Opto-isolated.
Protocol Type: Modbus/Jbus (RTU mode).
Type of Parameters: Run-time and configuration are available by serial link.
Device Address: From 1 to 255
NOTE: The physical interface can only support up to 31 devices for each segment. Use multiple
segments for more than 31 devices.
Baud Rate: 600 up to 19200 baud.
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