Beckhoff EL3783 Documentation page 135

Variable Meaning
Status word
See below [} 135]
Overrange Value after calibration > 0x7FFF
Underrange Value after calibration < 0x8000
SyncError - In DC mode: indicates whether a synchronization error occurred in the expired cycle.
This means a SYNC signal was triggered in the terminal, although no new process
data were available (0=OK, 1=NOK).
- Error in the synchronous oversampling, e.g. the number of ADC values and the
number of PDO values do not match.
StartTimeNextLatch In the 64-bit-wide process data StartTimeNextLatch, as was also the case with
(LO/HI) previous EL37xx terminals, the time is specified in each process data cycle when the
next SYNC1 pulse and thus the next block of sample values begins, referenced to the
currently transmitted block. StartTimeNextLatch thus changes in each cycle by the
amount of that task cycle time with which this terminal is operated. This time
specification is based on the terminal's local Distributed Clocks time.
By means of this time specification a concrete time can to be assigned to each
individual sample with the known oversampling factor.
Example:
With a cycle time of 1 ms (= 1,000,000 ns) and an oversampling factor of 20 in the
regarded cycle, the EL3783 supplies a StartTimeNextLatch = 7,777,216
measured values at 16 bits each as process data. The time of measurement of the 5
supplied sample is now to be determined, i.e. the Distributed Clocks time at which the
th
5
The currently supplied set of 20 samples was started at the time 7,777,216 –
1,000,000 (cycle time) = 6,777,216 ns. The time interval between the samples is
1,000,000/20 = 50,000 ns. Hence, the 5
6,777,216 + ((5 - 1) * 50,000) = 6,977,216 ns.
Sample Counter The Sample Counter is incremented by one unit with each process data cycle. The
(Cycle count) Sample Counter enables the higher-level controller to check whether a data record
has possibly been omitted or transmitted twice. In that case the DC shift time of the
terminal usually has to be adapted.
Current range High Current Range 1-4 geben Auskunft über den Strombereich jedes einzelnen
Samples.
High Current Range Active beschreibt zyklusweise, ob der 5A Bereich eingeschaltet
war oder nicht.
DcOutputShift, In these static variables the System Manager announces the shift time to which this
DcInputShift terminal has been set. The value is set once on activating/calculating the configuration
and also depends on the customer-specific settings in the extended slave settings.
It can be linked to offset calculations in the PLC.
Evaluation of the diagnostic values
It is urgently recommended to evaluate the offered diagnostic values in the controller, e.g. see the
notes page [} 99].
The evaluation of the Sample Counter (see above) e.g. provides a simple detection of communica-
tion errors and allow users to react accordingly in the software application.
Control/status word
Status word
The status word (SW) is located in the input process image, and is transmitted from terminal to the controller.
Bit SW.15
Name TxPDO
Toggle
EL3783
sample was determined.
SW.14 SW.13
TxPDO Sync
State error
Version: 1.1
th
sample was determined at the time
SW.12 SW.11 SW.10
- - -
Commissioning
and 2 x 20
dec
th
SW.9 SW.8
- -
135