Chapter 6. Errors and error recovery
Chapter 6 Errors and error recovery
6.1 Errors
If an error occurs with the optical link module or an abnormality arises with the transmission route, the
status display LED will indicate the error. The error information will also be set in the special CPU internal
output related to the relevant link module (R7DE, WRF007, WRF0E0 to WRF19F.)
"1" will be set in the special R7DE internal output when the ERR LED for the link module is
illuminated. The link module slot number on which the error occurs will be set in the special
WRF007 internal output at this point. If multiple error modules or transmission routes exist,
the small slot number will be reflected back. Note that once these values have been set in
place, there will remain in existence until cleared with an enforced set/reset function from a
user program or peripheral device. (As the special internal output stored in WRF0E0 to
WRD19F is controlled by the system, it will not remain in existence.) Error information
detected in the CPU module will be cleared by setting "1" is the special R7EC internal output.
Table 6.1 Description of Error displays
Contents
ERR
LED
Error Information
of own station
WRF0E0*
2
WRF140*
3
Details of errors
in each station
*
1
St.No. *
2
St.No. *
3
Timing of error detection
Timing of clearing error
Watchdog errors
Light
--
--
During microcomputer errors
- Switch on the power supply again.
- Press the [RESET] switch.
ROM/RAM
errors
Light
--
--
When the power is switched on,
when ROM/RAM errors occur
Transmission
route cut-off
Blink
(0.5s)
bit 8 ON
--
When the transmission route is
cut off
- Switch on the power supply again.
- Press the [RESET] switch.
- During transmission route recovery.
Duplicate station
No.
Blink
(0.5s)
--
--
When station No.s are duplicated - Switch on the power supply after the
cause of the error has been resolved.
Station No.
outside of range
Blink
(0.5s)
bit9 ON
--
When the dip-switch settings are
outside of the 0 to 63 range
- Press the [RESET] switch after the
cause of the error has been resolved.
Duplicate link
area assignment
Blink
(0.5s)
bit10 ON
--
When link assignment areas are
duplicated
- Switch on the power supply after the
cause of the error has been resolved.
- Press the [RESET] switch after the
Link area outside
of range
Blink
(0.5s)
bit11 ON
--
When the link area specification
from the CPU is outside of the
range
cause of the error has been resolved.
- When the link modules detects that
the error has been resolved.
Transmission
error
Blink
(1s)
--
bit14 ON
When a transmission frame error
occurs
- Switch on the power supply again
- Press the [RESET] switch.
Peripheral data
receiving timeout
Blink
(1s)
bit13 ON
bit13 ON
When a transmission time-out
occurs during peripheral data
transmission
- Press the [E.CRL] switch.
- When the link modules detects that
the error has been resolved.
Peripheral data
sum error
Blink
(1s)
bit13 ON
bit13 ON
When an abnormality occurs with
the peripheral data sum value
from the CPU
Peripheral data
address error
Blink
(1s)
bit13 ON
bit13 ON
When an abnormality exists with
the transmitting station No.
Peripheral data
response time-out
Blink
(1s)
--
bit15 ON
When a response time-out occurs
*1: Error information will be set separately for each station. Refer to section 4.5 for further details.
*2: The first link error information will be set.
*3: The second link error information will be set.
Table 6.2 Description of Error displays (Monitoring from CPU module)
I/O No.
Name
Contents
R7DE
Link module is abnormal
0 : Normal
1 : Abnormal
WRF007
Link abnormal slot number
I/O slot number different from parameter setting is stored
15
12 11
8 7
4 3
0
“0”
a
“0”
b
a : Unit number (0 to 2)
b : Slot number (0 to 2 )
6-1
