●
digital input (semiconductor),
DI
x
Furthermore, all of instrument models feature two “alarm ” lights
A1
and
A2
for indication of various states, that can be
considered as other special digital outputs. Function of these lights can be set in the same way as at standard digital outputs.
The behaviour of digital outputs can be programmed according to requirements as :
•
transmitting electricity meter pulse output mode
•
standard output mode
, e.g. as a simple two-position controller or a defined status indicator
The digital input
DI1
state is indicated with the
symbol and can be used for state monitoring via a communication link.
2.12.1 Outputs & Input Connection
Digital inputs & outputs are connected to terminals on a rear panel of an instrument according to the following table.
Connection of Digital Outputs & Input
pin No.
signal
15, 16
O1A, O1B … digital output DO1/RO1
17, 18
O2A, O2B … digital output DO2/RO2
19, 20
I1A, I1B ….... digital input DI1
All of digital outputs and input are
isolated not only from instrument internal circuits but mutually too
. Connected signals
magnitude must correspond with the I/O technical specifications. The signal polarity is free.
A connection cable maximum cross section area is 2.5 mm
2
.
2.12.2 Outputs Setup
The DO1/2 (RO1/2) output function can be checked in parameter group 11. Possible setup options are :
•
-
-
-
... the output DO1/2 (RO1/2) is disabled
•
-
0
-
... the output DO1/2 (RO1/2) is set to standard output mode (detailed setup available using the
ENVIS program via a communication line only)
•
n
n
n
... the output DO1/2 (RO1/2) is set to impulse output mode with nnn pulses per kWh; the control
quantity is ΣEP+ (no symbol shown). Other control quantities options according accompanying symbol :
•
-
… ΣEP-
•
… ΣEQL
•
… ΣEQC
