IGWiPS200-1
A. Analog Output and Digital Output Fault Response Selections
Three I/O modules (4-Channel Analog Output Module, 8-Channel Digital Output Module, and Combination
Input/Output Module) contain DIP switches that may be set by the user to determine the module’s response to the
connected transceiver’s loss of an RF Link or to the loss of an input signal. There is a DIP switch for each signal
channel allowing individual programming of each channel. See Figures 13, 15, and 16 on pages 23, 24, and 25
respectively.
When a loss of RF Link or signal occurs:
• If the DIP switch is set to ON, the default setting, the output from that channel will MAINTAIN LAST STATE.
• If the DIP switch is set to OFF, the output from an analog channel will be 2 mA; the output from a digital
channel will be OFF.
Refer to paragraph C to set the DIP switches.
B. Pulse Input and Pulse Output Mode of Operation Selections
The 2-Channel Pulse Input Module has five sliding-shunt switches, the complementary 2-Channel Pulse Output
Module has four DIP switches. Several switches are used to select mode of operation: counter or frequency. Others
allow selection of coupling, impedance, speed, and sensor input. Setting for Pulse Input and Pulse Output Modules
are detailed below. Refer to paragraph C to set the switches.
Pulse Input Module (See Figure 17 on page 26)
Switch 1 Coupling – AC or DC; Default setting is AC
Set the jumper to AC Coupling if the pulse voltage will never drop below 3.6V with respect to the
transceivers power supply negative. This would apply where there is a DC bias voltage added to the pulse
input voltage, where the DC bias exceeds 3.6V such as in a ground loop condition. All other applications,
including an AC sine wave input, should be set to DC Coupling.
Switch 2 Input Impedance – Low or High; Default setting is High
The Low impedance setting has an input impedance of 1K Ohm and the High setting has an impedance of
90K Ohm. Use the High impedance setting for magnetic transducers to prevent the current draw from
dropping the voltage below the 100 mVAC peak-to-peak minimum. Use the Low impedance setting for
digital and relay interfaces because the additional current draw will prevent electrical noise from causing
false pulse counts.
Switch 3 Operation – Counter or Frequency; Default setting is Counter
Pulse input values are stored in the PLC register in either of two formats: an absolute count of the number of
pulses, which will require that the register be reset periodically to prevent overflow, or a frequency value.
The frequency setting will take the average number of pulses every second.
Switch 4 Speed – Low or High; Default setting is High
The Low speed pulse setting is for a maximum input frequency of 2 Hz with a minimum pulse width of 70
ms. The High speed setting is designed for pulse frequencies up to 32 kHz and requires a minimum pulse
width of 10 microseconds. Use the Low speed setting for mechanical pulse generating devices such as relays
and the high speed setting for all other applications. The Low speed setting prevents contact bounce from
being recorded as pulses.
Switch 5 Sensor Input – Single Ended (Common Mode) or Differential Mode; Default setting is Single
Ended
If the pulse signal is expected to be of negative polarity, with respect to ground, set the module to Differential
mode, whereas if the signal will remain positive at all times, set it to Single Ended (Common Mode).
May 2007
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