Chapter Two
Installation
man_105_2.9.doc
Page
21
2.4.8
Pulse Output (105-1)
A single FET output to common rated at 30VDC, 500 mA is provide for the pulse output "PO".
This output accurately recreates the pulses counted at a pulse input at a 105-1 or 105-2 module.
If the counter device requires a voltage pulse signal (such as electronic or elector-mechanical
counters), use the 24V analog loop supply, or the 12V BAT supply for the voltage source. Use a
by-pass diode if the counter is inductive.
Some devices such as PLC counter modules power the pulse loop. For these devices, connect to
the PO and COM terminals of the 105U. The COM terminal will connect a ground/earth to the
external device. If this is not suitable, use a solid state relay to isolate the external device.
Although the count is accurately re-created, the rate of output pulses may not accurately reflect the
input rate. The actual input pulse rate may be configured to appear at an analogue output if
required. Note that the pulse rate and accumulated value will remain accurate even if a period of
communications failure has occurred. The maximum output rate is 100 Hz. If a high speed pulse
input is used (more than 100 Hz) on PI1 of a 105-2 module, the pulse input count should not be
transmitted to a PO on the 105-1 or DO on the 105-3 without configuring the divide-by-10 function
(on the 105-2 or 105-4 module)
2.4.9
Pulse Output (105-3 and 105-4)
The first four digital outputs on the 105-3 and 105-4 modules may also be used as pulse outputs.
The outputs are FET output to common rated at 30VDC, 500 mA. The outputs will provide a pulse
signal of up to 100 Hz. The outputs accurately recreate the pulses counted at pulse inputs at a 105-
1, 105-2 or 105-4 module.
Although the count is accurately re-created, the rate of output pulses may not accurately reflect the
input rate. The actual input pulse rate may be configured to appear at an analogue output if
required. Note that the pulse rate and accumulated value will remain accurate even if a period of
communications failure has occurred.
_
+
+24V
PO
COM
105U
Use by-pass
diode if counter
is inductive.
COUNT
+
_
+
_
+24V
PO
COM
105U
Use solid-state
relay isolator if
voltages are not
compatible