Baer DLX User Manual page 50

(neighboring lines, transmission distance) a shielded cable of sufficient di-
ameter should be used.
As each pulse is represented by a change of polarity, the signal con-
dition must be deactivated in "DLXPARA" (minimal high phase =
10msec).
Analogue Signal current input (analogue input 0..20mA or 4..20mA)
A continuous signal current flow is applied to the signal current inputs (e.g.
0..20mA or 4..20mA). This current is proportional to the actual demand.
The method of calculation can use pulses or digital values to transmit the
data to the DLX (Main-)CPU.
Pulse: For firmware version up to 1.05.06: the signal current input (analogue input)
measures power in order to establish energy consumption. The power is
measured over short intervals, multiplied by the time and the result is sum-
mated. This sum is equivalent to the energy consumed. If the sum exceeds
a fixed limit value "W", a 25msec internal output pulse is triggered and "W"
is subtracted from the sum. "W" is designated the pulse weighting and is
set such that at maximum demand a pulse frequency of 20Hz (pulse length:
25msec) is reached. The demand is measured via an external transducer
that converts the measured demand to an injected current (selectable
ranges: 0 to 20mA or 4 to 20mA).
Maximum current:
0..20mA (:=20mA)
4..20mA (:=16mA)
The signal condition must be deactivated in "DLXPARA" (minimal
high phase = 10msec).
Digital: For firmware version from 1.06.00 and up: the average value (50 scans per
second) will be send every second to the DLX-CPU.
The following types are used as output modules:
IAW el. Pulse output type „wipe" (solid state, Out1 to Out4)
Electronic outputs of type wipe behave the same as relay contacts, i.e. they
can carry a burden of up to 250V and 100mA for AC or DC. They combine
wear free switching with high switching frequency and are therefore ideal
for high pulse frequencies. They can drive S0 inputs directly.
Restriction: Wipe outputs are always of type "normally open".
IAW me. Pulse output type „wipe" (relay contacts, Rel1 and Rel2)
Mechanical relays are currently the only practical solution for the implemen-
tation of transmission lines without auxiliary voltage. Similarly, only me-
chanical components are available for outputs with change-over contacts
(idle contact and active contact). Due to a life span of approx. 5 x 10
are not suitable for the transmission of pulses.
Note: Electronic outputs (IAW el.) are generally less problematic.
50
72000 pulses per hour (:=3600sec × 20)
57600 pulses per hour (:=3600sec × 16)
5
they