Data Transfer; Psm Status Flags - GE PACSystems RX3i User Manual

3

Data Transfer

PSM Status Flags

%I Bit
Offset
1 PSM HeartBeatBit:
2 PSM ConnectionOK:
3 PSM PhaseShiftOK:
4 PSM DeltaVoltOK:
5 PSM DeltaFreqOK:
6 PSM AllGridAlarmsOK
7 PSM RelayCloseOK:
8 PSM New Data
9 - 16 Reserved
3-10
The PSM returns 80 status flag bits to the RX3i controller. Those 80 bits are grouped into
five 16-bit words.
The first status word (%I1 – %I16) contains the overall PSM status flags.

The following two words (%I17 – %I48) contain the individual grid measurement

faults. These flags identify the voltage/current channel experiencing a measurement
problem. It can be one or multiple problems related to:
- Input signal not present, that is, it is indicated as not measured in the
corresponding %Q flag bit AND it cannot be reconstructed by the PSM module
firmware.
- Input signal is measured but it is clamped due to a higher peak voltage/current
value than the maximum value allowed to be applied to the interface unit
 The last two status words (%I49 – %I80) contain the individual grid status flags,
including the ANSI alarms.
Definition
3
Alarm availability: A checkmark indicates whether an alarm is available for use in either the
1-Phase (1ø) or the 3-Phase (3ø) Grid Operational Mode (see "Mode Control Bits Sent to PSM
module" on page 3-19). All alarms are available in 3-Phase mode. An absent checkmark
indicates that the value of the bit is indeterminate and the bit should be ignored.
PACSystems* RX3i Power Sync and Measurement System – February 2013
Value
Toggled with every scan/sweep
1 = OK
0 = PSM to Terminal Assembly
connection failure
1 = OK
0 = ANSI 25/1 Alarm
1 = OK
0 = ANSI 25/2 Alarm
1 = OK
0 = ANSI 25/3 Alarm
1 = OK
0 = At least one alarm on either
grid is set
1 = OK
0 = Do not close relay
1 = The current PLC sweep is the
first sweep this power line
cycle data is being delivered
by the PSM to the PLC.
0 = Data has not changed from
previous sweep.
Status/Alarm Alarm
Timing Availability
A, B, AB: See
"Status/Alarm
ø
1
Timing" on page
3-13

Updated every
scan

A
A
A
A
AB
A

A
GFK-2749
3
ø
3
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