FloBoss 407 Instruction Manual
Rev 5/00 3-23
3.4.14 Low-Level Pulse Input Module
A schematic representation of the field wiring connections to the input circuit of the Low-Level Pulse
Input module is shown in Figure 3-20. The field wiring connections are made through a separate
terminal block that plugs in next to the module allowing replacement of the module without
disconnecting field wiring.
NOTE
The Low-Level Pulse Input module is designed to operate only with pulse-
generating devices having their own power source. The module does not work with
non-powered devices.
The low-level pulse input module operates when a field device provides a pulsed voltage between
30 millivolts and 3 volts peak-to-peak across terminals B and C of the module. The pulsed voltage is
counted and accumulated by the module, which provides the accumulated count to the ROC/FloBoss
electronics on request.
SELF-POWERED
PULSE DEVICE
+
+
C
B
A
N/C
200K
200K
DOC0150A
PI LL
Figure 3-20. Low-Level Pulse Input Module Field Wiring Schematic
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