Modbus process image in the memory of the COM461MT
36
COM461MT_D00011_00_M_XXEN/05.2013
7.2.6.2
A&T = Alarm type and test type (internal/external)
The alarm type is coded by the bits 0 to 2. The bits 3 and 4 are reserved and always
have the value 0. Bit 5 usually has the value 0 and represents the digital value of
the status. This column is relevant for the SMI472 only. Bit 6 or 7 are usually set
when an internal or external test has been completed. Other values are reserved.
The complete byte is calculated from the sum of the alarm type and the test type.
Bit
7
6
5
4
3
2
1
0
Meaning
Te
st
e
x
te
rn
a
l
Te
st
in
te
rn
a
l
St
atu
s
Rese
rv
ed
Rese
rv
ed
Ala
rm
Er
ro
r
Ala
rm
t
y
p
e
X
X
X
X
X
0
0
0
No alarm
X
X
X
X
X
0
0
1
Prewarning
0
0
X
X
X
0
1
0
Device error
X
X
X
X
X
0
1
1
Reserved
X
X
X
X
X
1
0
0
Alarm (yellow LED), e.g.
insulation fault
X
X
X
X
X
1
0
1
Alarm (red LED)
X
X
X
X
X
1
1
0
Reserved
X
X
X
X
X
…
…
…
Reserved
X
X
X
X
X
1
1
1
Reserved
Te
st
0
0
X
X
X
X
X
X
No test
0
1
X
X
X
X
X
X
Internal test
1
0
X
X
X
X
X
X
External test
