Manual
Weld Seam Detection System R4000 SND40
for Tubes, Cans and Drums
Communication with the PLC
B0059001 / Rev. 2.3
54
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
5.1.4 Input “Acknowledge of weld seam”
This function is possible only in the “
flat specimen
” mode. For this purpose the “
acknowledge
”
mode has to be switched ON in the system configuration.
In the “
flat specimen
” mode two signals can be evaluated by the PLC:
a) Weld seam detected (impulse)
b) Weld seam detected (duration)
Signal a) is active only as long as a weld seam actually is in front of the sensor. The resulting short
impulse can be extended by the SND40
. If the PLC evaluates the signal only cyclical (e.g. every
100 milliseconds) the signal may not be reliably detected.
Signal b) should be used then. This signal remains set until the weld seam is cleared.
A stored weld seam signal is only reset by setting the signal "
acknowledge weld seam
".
5.1.5 Input "Reset fault"
With this signal the output "
General fault
“ can be reset. If the fault is serious, the output remains
set.
Note:
Faults which repair themselves (e.g. by recovering the SPS voltage)
are reset automatically.
5.1.6 Output "Measurement start active"
Indicates that a measurement is active. For this purpose the signal "
measurement start
" has to be
applied at the input.
An exception is the set-up operation. Two cases have to be distinguished:
1.
Control test job: PLC
(Therefore the system parameter "
testjob control mode
" must be adjusted to “
PLC
”).
The operator can request the measurement in the set-up routine by pushbutton. Therefore, the
keys <
test job start
> or <
drive
> or (in the X/Y function) the key <
start
> can be used.
The status message "Waiting for PLC start" appears on the display of the SND40 and the
signals "Ready for measurement" and "Set-up active" are set. The PLC is now preparing a tube
for measurement (prepare tube for measuring and put the sensor on the tube).
When the signal "
measurement start
" is applied at the input, the measurement starts and the
output is set.
2.
Control test job: KM
(Therefore the system parameter "
testjob control mode
" is to be set to “
KM
”)
The operator can start the measurement in the set-up routine by pushbutton. Therefore, the
keys <
test job start
> or <
drive
> or (in the X/Y function) the key <
start
> can be used. The
measurement starts instantly and the output is set.
Note:
The signal "measurement start " does not have to be applied at the input. Before
pressing the <Start> button, the PLC has to prepare a tube for measurement
rotation and put the sensor on the tube.
3
The pulse length can be adjusted with the parameter
" off delay
"
.
