YOKOGAWA UT55A - Page 358

16-7
IM 05P01C31-01EN
Troubleshooting,Maintenance,andInspections
16
Errors during operation (Input/output Action)
Error
description
PVinput,RSP
input,
and aux. analog input
Ladder
calcula-
tion
Control
compu-
tation
Control output
Retrans-
mission
output
Alarm
action
Analog out-
put(control

output,
retrans-
mission

output)
Voltage
pulse out-
put
(control
output)
Relay out-
put
(control
output,
position
proportion-
al
output)
Feedback
input
(for
Position
proportion-
altype)
Contact
input
Contact
(alarm)
output
Commu-
nication
Burnout error when
RSP
input is used for
control (Loop 1, Loop
2)
Depends on the setting
of the parameter BSL
of the analog terminal
connected to the RSP
where the error occurs.
Upscale:105%
Downscale:-5%

Normal
action
Normal
action
When in AUTO and
RUN modes: Error
preset output
When in MAN
mode: MAN output
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Feedback input
resistor/current burnout
Normal action
Normal
action
Normal
action
Normal action
Normal
action
Normal
action
Normal
action
-
Position
proportional
output: OFF
105%
Normal
action
Normal
action
Normal
action
Ladder calculation
overow
Normal action
Undened
(calculation
with max.
value)
Normal
action
Normal action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Load factor is over
100%
Normal action
Does
not work
according to
the control
perio
d.
Does
not work
according
to the
control
perio
d.
Does not work
according to the
control perio
d.
Does
not work
according
to the
control
perio
d.
Does
not work
according
to the
control
period.
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
The
response
from the
main unit
slows.
Load factor is over
200%.(Forced
termination)
Normal action
Forced end
at200%
Does
not work
according
to the
control
perio
d.
Does not work
according to the
control perio
d.
Does
not work
according
to the
control
perio
d.
Does
not work
according
to the
control
period.
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Ladder program error Normal action
Undened
(Stopped
at the error
detection)
Normal
action
Normal action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
Normal
action
16.1Troubleshooting