Advertisement
2. SPECIFICATIONS
MELSEC-A
(2) A64RD4C
(4-wire type)
Disconnection at any channel is detected
and the
2 disconnection-
detected flag
(X19)
is turned ON.
If at least one channel is specified for conversion-enabled, disconnec-
tions will be detected.
1)
All channels are used
' - \ - ?
CH3
CH1
CH4
Disconnection
C H I
C H3
CH2
C H 4
Dlsconnection-
detected Flag
0
OFF*
X
X
X
X
ON
X
0
0
X
ON
0
0
X
Conversion-
enabled/disabled
o
. , . .
Enabled, x
....
Disabled
*
Since all channels used are conversion disabled, if no discon-
nections are detected, the disconnection detection flags remain
OFF,
2) Only channels
1, 2 ,
and
4
are used
CH1
CH2
CH3
CH4
CH1
CH3
CH2 CH4
Disconnection-
detected Flag
Conversion-
enabled/disabled
0
OFF
X
0
X
0
ON*
X
X
0
o
....
Enabled, x . . . .Disabled
*
Setting channel
3
(which is not used) to conversion-disabled
will be regarded by the CPU as a disconnection, thus turning
ON the disconnection-detected flag.
IMPORTANT^
Be sure to set the channel which is not connected to the Pt100 to conver-
sion-disabled. If
it is set to conversion-enabled, the disconnection-
detected flag will go ON.
2-11
Advertisement
