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EMA11 - USER MANUAL
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11.9) DIGITAL INPUT
In the DIGITAL INPUT menu it’s possible to program the digital input
function for both standards and options. The 2 standards digital input can
be programmed how follow:
•
Type , defines the type of operation:
- NOT USED: if none input is selected or enabled.
- CLOCK SYNCRONIZATION: Synchronization of the internal clock.
When the impulse arrives on digital input, the internal clock’s seconds
counter is cleared if it’s between 00 and 29, while if it’s between 30 and
59, it’s cleared and the minutes counter go on the next minute.
Example:
17:31:23 (hh:mm:ss) will be 17:31:00 08:45:55 (hh:mm:ss) will be 08:46:00
- PERIOD: to change the bands for the energy counter with time bands.
The following table shows the time band selected depending of the status of digital inputs:
DIGITAL INPUT 2 DIGITAL INPUT 1 BAND SELECTED
OPEN OPEN P1
OPEN CLOSED P2
CLOSED OPEN P3
CLOSED CLOSED P4
CLOSED: there is a voltage from 12Vcc and 24Vcc.
OPEN: the voltage is 0Vcc.
The change of band happens when the instrument recognizes a change of status on one of digital
input at least.
At the moment of the digital inputs enabling like “Periods” and at the EMA’s turn on with the
enabling already set, the energy counters increment continue on the last band enabled
independently of the digital inputs status until the change of the minute of the internal clock or the
change of the status of one of digital input.
-
COUNTERS: the generic counters are enabled. When an input receives a pulse, the counter,
joined at this input, is increased by the value that depends of the weight set.
-
Ext.DI: the function depends of the Sync. Avg set in the menu AVERAGE (par. 11.5). If Sync. Avg
is Int.Rtc a signal (12÷24Vcc) on the digital input 1 change the band (from P1 to P2 and vice
versa) while a signal (12÷24Vcc) on the digital input 2 is used to synchronize the average and the
average powers storing (if enabled) with a de-bounce time of 30 seconds. The digital inputs are
set automatically to Ext.DI if the Sync. Avg is set to Ext.DI or Int+Ext.
No congruent operation of digital input Type and Sync. Avg will involve
the visualization of the warning message on the display (see for example
in this figure). An affirmative answer will confirm the new setting on the
digital input and the setting of
Sync. Avg to Int.Rtc.
No congruent set between the
Type of digital inputs and the TRIGGER
storage will involve the visualization of the warning message on the
display (see for example in this figure). An affirmative answer will confirm
the new setting on the digital input and the disabling of the trigger storage
function.