Datasheet

Block diagram TOR
Function TOR
The TOR function is a counter interface which allows counting input signals
in a dened time interval.
2 TOR counters are available on each function module. Each TOR counter
includes 2 x 32-bit timers.
The TOR function is a scaled-down version of the Counter/Timer
function. The pulse signal of Timer 1 gives the start and stop pulse signal to
Timer 0. Timer 0 counts the input signals. After the stop signal from Timer 0
the number of pulses is stored and can be read through I/O read commands.
The timer 1 is used as a time reference generator.
The divider factor is written in timer 1 and determines the output frequen-
cy. The input frequency is set according to the PCI clock pulse or the 40 MHz
on-board quartz clock. Timer 0 is synchronised with the start event.
Pulse measurement
As soon as a start signal occurs from Timer 1, the Timer 0 is reset.
It counts the pulse signals of the channel Ax(Bx).
During the process the status bit “Counter in Progress” is set.
As soon as a stop signal occurs from Timer 1, the Timer 0 is stopped and the
status bit “Counter in Progress” is reset.
An interrupt can also be generated. The value can then be read. The latest
measured value is read in the counter measurement register.
Properties
Optical isolation of the inputs and outputs through opto-couplers to •
prevent ground loops
Interrupt status at the end of the measuring period
•
Inputs and output can be inverted through software•
Software GATE•
The function TOR occupies 4 inputs (A to D) of the corresponding function
module of the APCI-1710 or CPCI-1710.
Used signals
Pin name Signal type Function
Ax +/- Diff./TTL/24 V* Digital input 1 (TOR1)
Bx +/- Diff./TTL/24 V* Digital input 2 (TOR2)
Cx +/- Diff./TTL/24 V* External Gate (TOR1)
Dx +/- Diff./TTL/24 V* External Gate (TOR2)
x: Number of the function module (see pin assignment page 179)
*24 V for the APCI-1710-24V
183
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PCI, counter – APCI-1710