MSA SENTRY io - CPU and HMI Touchscreen Panel; Buzzer; Input and Output Devices; Input Power Sources

2 Overview
US SENTRY io 9
External Provided Power Supply
It is possible to power the SENTRY io using an external power supply. Contact the factory for details on how to implement
an external power supply.
2.2.3 CPU and HMI Touchscreen Panel
The integrated CPU and 7" HMI touchscreen mounted in the enclosure door and include:
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CPU/Logic Solver
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7" HMI touchscreen display (800x480 WVGA)
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16 GB microSD Memory Card
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(1) Ethernet port for Modbus TCP/IP, MSA Cloud connection, remote display, or Ethernet IP connections
NOTE: If a supplemental Ethernet port is installed on the HMI panel for additional communications, the base unit
PLC Ethernet cable must be moved to the last element (supplemental port).
If more than one physical Ethernet port is required, then use a supplemental Ethernet switch.
The front panel enables communication with the SENTRY io through the touchscreen and is used to:
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monitor the status of all connected detectors
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configure all settings
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provide alarm and fault histories
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allow gas trending over time
2.2.4 Buzzer
The SENTRY io buzzer is designed to audibly alert you when an event occurs. The buzzer is not intended to be the primary
indicator of an alarm condition.
The buzzer has distinct tones for both alarm and fault:
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Alarm—Steady tone
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Fault—Intermittent tone (1 second on, 1 second off)
The buzzer dial allows for volume adjustment. To adjust the buzzer dial, spin the tabs
on the inside of the buzzer dial.
NOTE: Buzzer volume level should be adjusted for ambient environment noise level.
2.3 Input and Output Devices
The SENTRY io responds to inputs and executes outputs in less than one second. The SENTRY io will also report any fault
condition or a failure in its internal communication in the same one-second time frame.
NOTE: The response time of the SENTRY io is dependent on the instrumentation connected to it.
2.3.1 Input Power Sources
The SENTRY io is designed to accept 120 VAC or 240 VAC input power sources. The input power wiring termination
blocks are located in the lower right hand corner of the panel. The installer should land the main AC power source at the
proper VAC input terminals shown below. All other internal VAC and VDC power distribution wiring is factory installed.