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
O
PTIONAL
S
ERIAL
C
OMMUNICATION
I
NTERFACE
S
PECIFICATION
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.
Содержание ATC770
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