Datasheet

Function Digital input and output
The Digital input and output function allows an easy access to the digital
I/O available on the function modules. The I/O level of the input and output
channels are read and set or reset through read/write commands. The dig-
ital I/O have no logical connection to each other. The connection can only
be made through software. The complete isolation through opto-couplers
avoids earth circuits.
Available channels
3 x 24 V mass-related input channels, optional 5 V•
2 x differential input channels (RS422/485), •
can also be used as TTL input channels
1 digital output, 24 V, load to ground (10 to 36 V / 500mA)
•
2 differential inputs or outputs (RS485), •
can also be used as TTL input or output channels. Software conguration.
Function ETM (Edge Time Measurement)
The ETM function is a timer interface which allows measuring the duration
of a period, and simultaneously, the “High” or “Low” level time of this
period. A function module with the ETM function has
1 timer to create a time base
•
2 counters to measure the period duration•
2 counters to measure the “High” or “Low” level time•
2 gate inputs•
The ETM function uses 4 inputs (A to D) with each function module of the
APCI-1710 or CPCI-1710. Up to 8 ETM (2 per module) can be operated on
one board.
Properties
Optical isolation of the inputs and outputs through opto-couplers to •
prevent ground loops
Interrupt status at the end of a period
•
Timer can be read back•
Inputs and outputs can be inverted through software•
Software gate•
Block diagram ETM
xor
Gate
Trigger edge
Time base
Edge level
32-bit reload register
32-bit counter
Timer
Division factor
32-bit counter
32-bit latch register
Period counter
Clear
32-bit counter
32-bit latch register
Level counter
Clear
Enable
Period
measurement
Level
measurement
PCI bus clock (30 MHz
or 33 MHz) / 4 or
internal reference clock
of the board (40 MHz) / 4
Typical applications
Period duration measurement•
Level duration measurement•
Used signals
Signal name Pin name Signal type Function
Gate0_x Ax +/- Diff./TTL/opt. 24 V* Gate input of ETM counter 0
Input0_x Bx +/- Diff./TTL/opt. 24 V* Input of ETM counter 0
Gate1_x Cx +/- Diff./TTL/opt. 24 V* Gate input of ETM counter 1
Input1_x Dx +/- Diff./TTL/opt. 24 V* Input of ETM counter 1
When the digital I/O function is programmed on all function modules, up to
28 digital input and 12 digital output channels are available
Used signals
Pin name Signal type Function
Ax +/- Diff/TTL/24 V* Dig. input and output (with 24 V* only input)
Bx +/- Diff/TTL/24 V* Dig. input and output (with 24 V* only input)
Cx +/- Diff./TTL/24 V* Digital input
Dx +/- Diff./TTL/24 V* Digital input
Ex 24 V / 5 V optional Digital input
Fx 24 V / 5 V optional Digital input
Gx 24 V / 5 V optional Digital input
Hx 24 V / 500 mA Digital output
(10 – 36 V)
x: Number of the function module (see pin assignment page 179)
*24 V for the APCI-1710-24V
x: Number of the function module (see pin assignment page 179)
*with the APCI-1710-24V
185
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PCI, counter – APCI-1710