
B-61813E/03 MAINTENANCE 2. INDICATION
−147−
(2) When the unit No. (1 to 16) is on (o-on and ×-off)
M/S ER2 ER1 ER0 Error Description Major cause of error
××ס Basic unit peripheral error The basic unit is abnormal. Basic unit failure
¡ × ¡ × Basic unit number error A unit with an invalid unit
number has responded to the
interface unit.
-
×ס¡Basic unit reception data count
error
The number of communication
bytes has exceeded four.
Two or more units have the
same unit number, or the unit
of interest is not provided with a
terminating resistor.
ס
(*1)
¡ ××Basic unit framing error The communication end signal
is abnormal.
Two or more units have the
same unit number, or the unit
of interest is not provided with a
terminating resistor.
ס
(*1)
¡ × ¡ Basic unit DMI error The communication waveform
has been distorted.
Two or more units have the
same unit number, or the unit
of interest is not provided with a
terminating resistor.
ס
(*1)
¡¡× Basic unit CRC error The communication data is
abnormal.
Two or more units have the
same unit number, or the unit
of interest is not provided with a
terminating resistor.
× ¡¡¡Basic unit watchdog timer error Communication with the
interface unit has stopped.
-
NOTE (*1)
If M/S lights, it means that the interface detected the
error.
If it does not light, it means that the basic unit detected
the error.
2.3.5 M/S indicator
If an error occurs on a distributed link, the M/S indicator indicates
whether the error was detected in the interface module or basic error
side.
On: The error has been detected on the interface module side.
Off: The error has been detected on the basic unit side.