LINK Systems OmniLink II Press Automation Control - Manual (Page 114)

August 30, 2002 Manual Version 1.0 6.9
mechanical sensors. For these sensors, it may be necessary to source more current through the sensors
than required with solid state sensors in order to maintain good contact. If the lower input impedance is
required, the corresponding Pullup Resistance DIP switch should be switched to the ON position. The
factory default setting for all switches is OFF. The DIP switch is shown on Figure 6.2 for Model 5120
and Figure 6.3 for Model 5121. The low impedance option is not available via the internal terminal
block connection or via the quick die change receptacle.
Section 6.4.5.3 Sensor Connection via Optional Quick Die Change Receptacle
If a unit is purchased with the optional 19 pin quick die change receptacle, sensors can be connected to
all channels via the quick die change receptacle. In addition, the unit’s 24 volt DC power supply is
available via this connector. The pin connections for the quick die change receptacle are shown on
Figure 6.2 for Model 5120 and Figure 6.3 for Model 5121.
Section 6.4.5.4 Sensor Connection via the Optional Sensor Dock
An optional sensor dock with 8 Micro-DC connector receptacles can be purchased. This sensor dock
Connects to the Digital Die Protection and Process Monitor via the quick die change receptacle. If a
sensor dock is connected to a 16 channel unit, Model 5120, the receptacles on the sensor dock will
connect to channels 9-16 of the Digital Die Protection and Process Monitor. If a sensor dock is
connected to an 8 channel unit, Model 5121, the receptacles on the sensor dock will connect to channels
1-8 of the Digital Die Protection and Process Monitor. The connections for the sensor dock are shown
on Figure 6.2 for Model 5120 and Figure 6.3 for Model 5121.
Section 6.4.5.5 Solid State Sensor Single, Series, and Parallel Connections
Normally only one sensor is wired to an individual input. Since the system can be expanded to as many
as 80 inputs, only one sensor per input is suggested. Multiple sensors can be wired in series or parallel
to expand monitoring capabilities. When solid state sensors are wired in series or parallel, they must be
of the same type. Do not mix NPN and PNP sensors when wiring them in series or parallel. Figure 6.4
shows single, series, and parallel connections for both NPN and PNP solid state sensors. When wiring
solid state sensors in series, ensure that the total voltage drop across all sensors does not exceed the
value specified in Table 6.2. Also, the power up delay for each sensor must be considered since the last
sensor in line is not powered until the upstream sensor is closed. When wiring solid state sensors in
parallel, add the leakage current of each sensor to determine the total leakage current. This total current
must not exceed the maximum leakage current listed in Table 6.2.