Chapter 3: Main Circuit Board Wiring
45
Table 3.5—DIP Switch Functions for Frequency Pulse Input SW1 and SW5
Position
#
Closed (ON)
Amplified and
Contact
Closure
Magnetic
Pickup Coil
1
Connects Pin- to circuit ground.
Closed (On)
Open (Off)
2
For open collector and dry contact inputs, connects
Pin+ to a 5V pull-up resistor and input divider; can
also be closed for amplified signals.
Closed (On)
Open (Off)
3
Connects the high-level signal from Pin+ to the
comparator circuit that squares up the waveform.
Closed (On)
Open (Off)
4
For turbine meter magnetic pickup coil signals,
connects the Pin+ terminal to an amplifier.
Open (Off)
Closed (On)
5
For turbine meter magnetic pickup coil signals,
connects the output of the flow computer’s pulse
preamplifier to signal comparator for low-level
signals.
Open (Off)
Closed (On)
6
Debouncing - input sampling at 32 Hz allows
detection of signals up to 16 Hz (higher frequency
pulses generated by contact bounce will be
rejected).
Closed (On) –
for dry contact
inputs
Open (Off)
Summary of Contents for NUFLO 1141C
Page 1: ...Manual No 30165009 Rev 01 NUFLOTM Scanner 1141 RTU Hardware User Manual ...
Page 28: ...Scanner 1141 Hardware User Manual 28 Figure 3 1 Scanner 1141 main circuit board ...
Page 66: ...Scanner 1141 Hardware User Manual 66 ...
Page 67: ...Chapter 6 Parts List and Order Code 67 Chapter 6 Parts List and Order Code Scanner 1141C ...
Page 68: ...Scanner 1141 Hardware User Manual 68 Scanner 1141L ...
Page 69: ...Chapter 6 Parts List and Order Code 69 Scanner 1141G ...
Page 91: ...Appendix A Specifications 91 Outline Dimensions Scanner 1141C ...
Page 92: ...Scanner 1141 Hardware User Manual 92 Scanner 1141L Front and Side Views ...
Page 94: ...Scanner 1141 Hardware User Manual 94 Scanner 1141G ...
Page 96: ...Scanner 1141 Hardware User Manual 96 Drawing 1 Installation ...
Page 97: ...Appendix B Control Drawings 97 Drawing 2 Power Supply ...
Page 98: ...Scanner 1141 Hardware User Manual 98 Drawing 3 Communications Serial Ports ...
Page 99: ...Appendix B Control Drawings 99 Drawing 4 Status Pulse Inputs Outputs ...
Page 100: ...Scanner 1141 Hardware User Manual 100 Drawing 5 RTD Inputs Analog Inputs Outputs ...
Page 101: ...Appendix B Control Drawings 101 Drawing 6 Analog Outputs ...
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