Rockwell Automation 1771-VHSC , D17716.5.74 Very High S - Manual (Page 30)

2–4 Installing the Very High-Speed Counter Module
The VHSC module has user-selectable jumpers for each input
channel. These jumpers consist of one each:
•
filter or high speed operation jumper
•
+5V or +12-24V operation jumper
Each counter has a total of 6 jumpers associated with it:
•
Channel A filter/high speed jumper
•
Channel A voltage jumper
•
Channel B filter/high speed jumper
•
Channel B voltage jumper
•
Gate/reset filter/high speed jumper
•
Gate/reset voltage jumper
These jumpers can be set independent of each other. You can select
the filter action and voltage for each channel and for the gate/reset
input independently.
The high speed operation is the preferred mode of operation for the
1771-VHSC module. Use this mode when the inputs are driven by
devices such as encoders or line drivers.
Use the filter mode on the inputs when a mechanical switch is
providing the input. The filter provides de-bouncing for the
mechanical switch. The frequency of counting must be less than
100Hz when the filter mode is selected.
Use these jumpers to match the operation of the module with the
input supplied. Settings are shown in Figure 2.2.
To set the jumpers, proceed as follows:
1. Remove the four screws securing the side cover to the module
and remove the covers.
2. Using your fingers, reposition the jumpers associated with each
input channel according to your requirements. Refer to
Figure 2.2.
Setting the Configuration
Jumpers