2. Setup
24
CNT32-4MT(LPCI)
Check method 2: Checking the Board single-handedly
(with external connection)
When the test pulse outputs are set to external outputs, the board outputs LVTTL-level output pulses
at 100 kHz from the output pins (TPOA and TPOB). Using the test pulse outputs for external connection,
the diagnosis program can check whether the input circuit of the board normally works as a single unit
along with the driver. Using the test pulse outputs allows the board to count pulse signals as if it were
actually connected to an external device. See the following section for the connection.
If the board fails to perform counting normally by check method 2, its input circuit may be defective.
Test pulse output circuit and its sample connection (TPOA and TPOB)
CNT32-4MT(LPCI) has one test pulse output for phase-A and another for phase-B for self-diagnosis
purposes. The output pulses are LVTTL-level output at fixed 100 kHz.
To check the board in single-phase input mode, connect either the phase-A or phase-B test pulse output
only. The board performs up-counting (incremental counting) or down-counting (decremental counting)
with only the phase-A or phase-B test pulse output connected, respectively.
Connect the pull up pin to the 3.3V output pin.
PCI Board
3.3V
Vcc
(34 pin)
PUP1
(32 pin)
A0
(1 pin)
TPOA
(27 pin)
B0
(2 pin)
TPOB
(61 pin)
Pin numbers in the diagram shows those of connector on the board.
Figure 2.4. Sample connection to counter input circuit (ch0)
