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2600 Family Instruction Manual

Chapter 9 : Model 2620 Counter Module

time has been programmed so that the appropriate gate period

will be generated.

If the internal time gate generator can’t be used for some

reason (e.g., irregular gate time or different channels must

operate with different gate times) then a second counter

channel must be configured to serve as a gate generator for the

frequency counting channel.

The frequency counting channel is configured as a “gated pulse

counter.” It counts pulses from an external signal while the

counting gate is active. When a measurement is completed, the

result is latched and the next measurement begins

automatically. The most recently acquired measurement value

may be read from the latch at any time

Set the Mode register as follows:

Connect the channel as follows:

9.6 Specifications

Field Value Notes

0 Index (gate) polarity is active high.

1 Preload on index (gate) leading edge.

LAT

1 Latch on index (gate) leading edge.

CET

1 Enable counting on index (gate) leading edge.

4 Count external, single-phase clock.

PLM

0 Use only Preload0, which must contain 0.

1 Index connected to internal time gate generator.

Signal Connect To

ClkA

Input signal to be measured.

ClkB

+5V or open (count up)

Index

Output

Field Value Notes

Table 28: Model 2620 Specifications

Counters Resolution 32 bits

Counter channels 4

Count rate 10 MHz, maximum.

Input clock Maximums (derate for deviations from 50% duty cycle):

2.5 MHz @ quadrature x4.

5 MHz @ quadrature/mono x2.

10 MHZ @ quadrature/mono x1.

Internal clock 10 MHz.

Input/Output Signals Clock input RS-422 differential, TTL/5VCMOS compatible, ±7V CMV maximum.

Index input RS-422 differential, TTL/5VCMOS compatible, ±7V CMV maximum..

Count Enable input TTL/5VCMOS compatible.

Counter output TTL/5VCMOS compatible.

Device Power Outputs Output voltage 5VDC ±5%.

Output current 400mA, max., total for all channels.

Fuse Socketed 500mA fuse per channel.

Mating Connectors

(*) = included with module

IOM port (qty 1) RJ-45 plug, AMP 554169 or equivalent

Counter I/O (qty 4) (*) Pluggable TB, 10-pin, RIA 31166110 or equivalent

Temperature Operating range 0 to 70°C

Power Input power +24V ±5% @ 30mA, not including external device power.

Dimensions Outer dimensions 5.0H x 4.1W x 2.0D inches, including DIN mounting frame. Depth is specified with respect

to surface of DIN rail support panel; additional clearance required for field wiring.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 79 80

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