27
DM and IR Bit Allocation
Section 4-2
4-2
DM and IR Bit Allocation
The following DM and IR bits are allocated to the Special I/O Unit for the
C200H, C200HS, C200HX, C200HG, or C200HE PC.
DM Area
A block of 100 words between DM 1000 to DM 2599 is allocated to the Spe-
cial I/O Unit.
The words allocated to the Special I/O Unit are within the following range.
Words m to m+99 (m = 1000 + 100
×
Unit No. 0 to 15)
Upper and lower limits, output pattern, and other settings for each mode are
stored in these words.
Note
Unit numbers 10 to 15 (A to F) are available only when the C200HX, C200HG,
or C200HE PC is used with the C200H-CT021.
IR Area
A block of 10 words between IR 100 to IR 199 or IR 400 to IR 459 is allocated
to the Special I/O Unit.
The words allocated to the Special I/O Unit are within the following range.
Words n to n+9 (n = (100 + 10
×
Unit No. 0 to 9) or (400 + 10
×
(Unit No. – 10)
(Unit No. 10 to 15))
Note
Unit numbers 10 to 15 (A to F) are available only when the C200HX, C200HG,
or C200HE is used with the C200H-CT021.
IR words n and n+1 are used for outputs from the PC to the Special I/O Unit
and IR words n+2 to n+9 are used for inputs from the Special I/O Unit to the
PC.
IR output words includes information to control the Special I/O Unit, such as
Start, Stop, and Data Transfer commands.
The status data blocks of the Special I/O Unit, such as present counter value
and operation data, are input to the PC from the input data area.
Data of 100 DM words is transferred to the Special I/O Unit when the Special
I/O Unit is turned ON or restarted.
Summary of Contents for C200H-CT021
Page 1: ...C200H CT021 High speed Counter Unit Operation Manual Revised December 2000 ...
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