User manual

Chapter Two Installation
man_905-105_2.9 Page 21
received to that output for a certain period. . See Chapter 4 Configuration for further details.
2.4.6 Pulse Input (905-1)
For the ”-1” module, digital input 1 may be configured as a pulse input (max rate 100 Hz, min. off time
5 ms). In this mode, both the pulse rate and the pulse count are available for mapping to a remote
output. The pulse rate may appear at any analog output on the remote unit, while the pulse count can
appear at a Pulse Output on another ”-1” or Digital/Pulse Output on a ”-3” or “-4” unit. The pulse input
should be connected in the same way as a digital input.
2.4.7 Pulse Inputs (905-2 and 905-4)
For the ”-2” and ”-4” modules, the four digital inputs (DI 1-4) may be configured as pulse inputs. The
first digital/pulse input DI 1 has a maximum rate of 1000 Hz (min. off time 0.5 ms), while DI 2-4 have
a maximum rate of 100 Hz (min. off time 5 ms). When using DI 1 at high pulse rates (more than 100
Hz), a divide by 10 function may be configured to reduce the pulse count at the output, as Pulse
Outputs have a maximum rate of 100 Hz.
For each pulse input, both the pulse rate and the pulse count are available for mapping to a remote
output. The pulse rate may appear at any analog output on the remote unit, while the pulse count can
appear at a Pulse Output. The default update time for pulse counts is 1 minute. This can be changed by
changing the update time configuration - refer Chapter 4 Configuration for further details. The pulse
count is a 16 bit value - “roll over” of the count when it exceeds the maximum value is automatically
handled by the modules.
Pulse inputs should be wired in the same way as digital inputs (see Section 2.4.1).
2.4.8 Pulse Output (905-1)
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 another 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 analog 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.
2.4.9 Pulse Output (905-3 and 905-4)
The first four digital outputs on the ”-3” and ”-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