Moeller DF51 - Page 52

Installation
10/05 AWB8230-1541GB
48
Terminal AM supplies an analog reference signal from 0 to +10 V
(default = 0 to 50 Hz). The reference potential is terminal L. The
analog signal can be configured with parameters PNU B080, C028
and C086.
If a relay is connected to one of the digital outputs 11 or 12,
connect a freewheel diode in parallel to the relay to prevent
destruction of the digital outputs through the self-induced e.m.f.
which results when the relay is switched off.
The two digital outputs 11 and 12 contain optically decoupled
open-collector transistors. Up to 50 mA can be applied to each of
them. Their common reference potential is terminal CM2
(max. 100 mA).
Internal diode matrix R1 to R4 allows the connection in sink-type
or source-type logic (a fig. 49).
Figure 47: Example: analog measuring instrument
0...+10 V
F 1 mA
AM
0 V
L
Figure 48: Relay with freewheeling diode (e.g. ETS-VS3)
h
Use relays that switch reliably at 24 V H and a current of
about 3 mA.
+ 24 V
100 mA
CM2 1211
Figure 49: Digital outputs
11
+24 V
0 V
CM2
R2
K1
R1
Sink type logic
11
+24 V
0 V
CM2
R4
K1
R3
Source type logic
CM2
R2
R4
R3 R1
11
K1