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Pulse Catch Input

Mode 50

UP Counters

Installation and

Safety Guidelines

7–4

Pulse Catch Input

DL205 High Speed Counter

Interface Manual, 2nd Ed, Rev. A

Understanding V-Memory

Setup Locations

The Pulse Catch Input, Mode 50, associated with the D2-CTRINT requires

V-memory configuration in order to be used.

V-memory location V7633 is the most important of all the reserved memory areas

because it stores the value which lets the CPU know which mode has been selected.

The following diagram shows the 16–bit word and the various information it stores,

including the values used for the Counter Interface Module.

The example shown here uses the Pulse Catch Input, Mode 50, the lower and upper

bits are set to 10 so the backup battery is enabled. Together they form the

hexadecimal number 1050.

015 14 13 12

Memory Location V7633

11 10 123456789

Bits

00000010100 0000

10 0

D2-CTRINT Mode Setup

Binary Coded Decimal:

00 = Not Used

10 = UP Counting Mode

20 = UP/DOWN Counting Mode

30 = Pulse Output Train

40 = High Speed Interrupts

50 = Pulse Catch Inputs

60 = Discrete Filtered Inputs

Miscellaneous Setup

Binary Coded Decimal:

00 = Not Used (default)

10 = Battery Enabled (DL230/240/250–1/260)

20 = Power Up in Run (DL230 only)

30 = Selects both Battery Enable

and Power Up in Run (DL230 only)

40 = Mode Change Enable in K–sequence (DL240 only)

50 = Battery Enable and Mode Change Enable

in K–sequence (DL240 only)

NOTE: It is important to look at the entire 16 bits at V7633. If the RLL program only

sets the bits in the lower byte when entering the Counter Interface mode value, the

upper bits will be overwritten with zeros (0’s). Always enter a 4-digit BCD value in the

V-memory. This way, the proper value will be written into the upper bits.

There are also other V-memory locations which contain Counter Interface setup

information for each I/O point. They will be automatically configured with default

values for each Counter Interface mode selected.

1 2 3 4 5 6 7 8 9 10

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Pulse 260 Manuel d'utilisateur Page 4

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