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El módulo Alpha 933 dispone de 18 entradas totalmente aisladas diseñadas
para registrar con precisión eventos.
The module will monitor and
record a sequence of events referenced against real time such as trips
and control reaction in industrial plant so that cause and effect can be
studied. These events are buffered and made available to the host
computer without the risk of missing subsequent changes in the process.
Each module has an independent buffer that can be interrogated as
required. Input state changes can also be counted without affecting event
recording. The current sense or status and counter value of inputs can be
returned to the host as required.
Input signals are conditioned and common problems such as contact bounce
are handled flexibly and therefore multiple events are not recorded on
mechanical contacts. The resolution of event recording is 1mS and
synchronisation can be maintained between all 933 recorders in a
distributed application. The host communicates with the 933 using the
RS485 communications network and there are a small number of commands
involved configuring the module. Frequency measurements can be made on
all inputs up to a maximum of 900 Hz however channels 7 & 8 are
capable of a maximum of 20 kHz. Cycle period and interval measurements
can also be made on channels 1 & 2 for improved resolution on low
frequency signals. Notes.
1 If the processed events exceed the buffer capacity the event recording
'freezes' thus preserving the first 250 events. An event is defined as
all input changes within the specified de-bounce interval. (e.g. if
several channels change within a 100mS period and the de-bounce interval
was set for 100mS for all these channels then it would be recorded as one
event).
2 Sync Interface. In applications using more than one 933 where the
measurement of events captured on different units must be in agreement to
1mS the modules can be synchronised using the SYNC terminals connected.
The SYNC LED on the 933 designated the master indicates successful
synchronisation and is illuminated continuously when lock is achieved on
slave 933 units.
Especificaciones 933:
Número de canales:.18 (two pole disconnectable screw terminal)
Input isolation ........250 V RMS fully isolated
Input threshold........ 3 Volts
Input operational range........ 4 - 24V RMS 50/60 Hz (direct connection)
Input current........ 2 mA @ 5 Volts
Debounce options........ 1, 10, 50, 100mS selectable on each three groups
Event measurement resolution........ 1 mS
Event registration between 933 units........ 1 mS using sync connection
Max. input state change rate for counting........ 400 cycles/sec 1:1 mark
space
and events recording........ 800 changes/sec/channel
Buffer capacity for processing events........ 250 per 18 channels
Función
de contador:
Number of channels........ 18
Maximum count value....... 65535
Maximum count rate........ 400 cycles/sec all channels 20000 pulses/sec
on channels 7 & 8
Medida
de Frecuencia:
Gate time........ 1 sec, 10 secs.
Maximum input frequency........ 400 pulse/sec all channels, 20000
pulses/sec on channels 7 & 8
Resolution (max.)........ 0.1 cycle/sec
Medida
de periodo:
Number of channels........ 2 (channels 1 & 2)
Maximum cycle period........ 60 seconds
Measurement resolution........ 1 mS
Multiple period measurement........ 1,10,100 periods
Effective period resolution (100 periods)........ 10 uS
Medida
de Intervalos:
Number of channels........ 2 (channels 1 & 2)
Maximum pulse duration........ 60 seconds
Measurement resolution........
1 Ms
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