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PAC2000S12-B1 PSU
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0x00: standard backup mode
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0x01: cold standby active mode
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0x02: standby PSU 1 in cold standby mode
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0x03: standby PSU 2 in cold standby mode
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0x04: standby PSU 3 in cold standby mode
PMBUS_CMD_SET_PSALERT: forcible alarm command
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Write 0x20 to forcibly interrupt the signal alarm.
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Write 0x00 to clear the software control and restore the PSU normal control.
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Writing other values is invalid.
PMBUS_CMD_READ_INPUT_TYPE: input voltage type
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0: no input or input voltage abnormal
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1: AC input
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2: HVDC
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3: low-voltage DC
PMBUS_CMD_LED_CTRL: LED indicator control
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Bit 7: 1 indicates active PSU control (the indicator is valid), and 0 indicates PSU automatic
control.
–
Bit 1: 1 indicates that the orange LED indicator is on, and 0 indicates that it is off.
–
Bit 0: 1 indicates that the green LED indicator is on, and 0 indicates that it is off.
NO TE
If bit 0 and bit 1 are written to 1 at the same time, the command is invalid.
10.4.3 Online Upgrade
Both the primary and secondary sides of the PSU support online upgrade.
10.4.4 Black Box Function
The PSU has 440-byte space for storing fault logs. The PSU provides a read channel for external
systems by the Read Event Log command.
10.4.4.1 Runtime Counter
The PSU needs to calculate the total runtime. The total runtime is the sum of the time when the
PSU works properly (OPOK signal is normal), is presented in the unit of seconds, and occupies four
bytes.
10.4.4.2 Event Log
The PSU maintains a circular event log of the last ten records. Before saving the event log, the PSU
shall set the event update flag in the event log to 1. Each event shall start with an event number
followed by a 4-byte runtime (measured in minutes). The total runtime must be updated before the
log is saved.
Technical Manual
10 Communication
53
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