SMY133-SMY134-SMP133 Operating Manual
6. Inputs & Outputs
Instruments can be optionally equipped with a combination of outputs and inputs (see manufactured
models marking below). Following I/O types are available :
•
electromechanical relay digital output, referenced as
ROx
(x =output number)
•
solid state (semiconductor) digital output –
DOx
•
digital signal input (solid state) –
DIx
•
analog input , usually of range 0-20 mA
DC
–
AIx
•
temperature input, usually for a Pt100 sensor –
T
E
Depending of instrument model following inputs & outputs are available :
I/O Combination Assortment
model
I/O combination
I/O character
RR
2 x RO + 1 x DI
bipolar (AC/DC)
RI
1 x RO + 1 x DO + 1xDI
bipolar (AC/DC)
II
2 x DO + 1 x DI
bipolar (AC/DC)
V
4 x DO/DI (bidirectional)
unipolar (DC)
W
2 x RO +
2 x DI
bipolar (AC/DC)
unipolar (DC)
AA
1 x DO/DI (bidirectional)
2 x AI
unipolar (DC)
20mA DC loop (shared with RCM)
AT
1 x DO/DI (bidirectional)
1 x AI
1 x T
E
unipolar (DC)
20mA DC loop (shared with RCM)
Pt100
All of the „RR / RI / II“ models have 2 digital outputs and 1 digital input. Both outputs and input are
bipolar, i. e. signal polarity is free and even AC signals can be switched and read.
By contrast, the „V“ models have 4 digital inputs/outputs and any of them can be used as either input
or output. The signal polarity must be kept ; it depends on whether particular I/O is used as input or
output (see description below).
The „W“ models have two electromechanical relay outputs ( so marked as RO1 and RO2) and two
unipolar digital inputs (DI1, DI2).
The „AA“ and „AT“ models have 1 digital input/output of the same features as that of the „V“ models.
Next, depending of the model, they have either 2 or 1 residual current input(s), that – if not used for
residual current measurement - can be used as 0-20mA DC (or 4-20mA DC ) current loop analog
input. The „AA“ models have 2 such inputs, the „AT“ models only 1. Instead of the second one, the
„AT“ models have a Pt100 temperature sensor input for an external temperature (T
E
) measurement.
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 :
•
standard output
... a simple two-position controller or a defined status indicator
•
pulse output
… transmitting electricity meter (only DO-type outputs)
•
time synchronization output
… for transmission of second or minute pulses
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