Omron C200HG Manual Do Utilizador

This instruction inputs up to 64 signals from an 8 x 8 matrix using 8 input points
and 8 output points. Any 8 x 8 matrix can be used. The inputs must be connected
through a DC Input Unit with 8 or more points and the outputs must be connected
through a Transistor Output Unit with 8 or more points. The basic wiring and tim-
ing diagrams for MTR(––) are shown below.

8th row

7th row

1st row

ID 211 I/O Unit

B0

B1

B2

B3

B4

B5

B6

B7

B8

B9

A0

A1

A2

A3

A4

A5

A6

A7

A8

A9

A0

A1

A2

A3

A4

A5

A6

A7

A8

Matrix select signal

Matrix status

Bits indicating
input status

One-round Flag (bit
08 of output word)

Each round completed in 24 executions

00
01
02
03

04
05

06
07

00
32
64
00
32

64
06

The 64 keys can be divided into 8 rows (including a row for OW bit 08) which are
scanned consecutively. Since each row is scanned for 3 cycles, a delay of up to
25 cycles can occur before a given row of keys is scanned for inputs.

I/O refreshing must be performed for all I/O points used by MTR(––) each time it
is executed to ensure effective operation. The I/O REFRESH instruction must
thus be used with MTR(––) whenever MTR(––) is used in a subroutine to ensure
that the I/O points are refreshed each execution.

MTR(––) will be executed from the first cycle whenever program execution is
started, including restarts made after power interruptions.

SR 25403, which is turned on while MTR(––) is being executed, is reset in an
interlocked program section and MTR(––) is not executed in an interlocked pro-
gram section.

Do not use MTR(––) more than twice in the program.

MTR(––) cannot be used for I/O Units mounted to Slave Racks.