65
To leave the TC area uncleared and retaining Program Memory addresses
00000 through 00122, input as follows:
00000
00000
00000
00000MEM CLR ?
HR CNT DM
00000MEM CLR ?
HR DM
00123MEM CLR ?
HR DM
00000MEM CLR
END HR DM
4-5-4 Registering the I/O Table
The I/O Table Registration operation writes the types of I/O Units controlled
by the PC and the Rack locations of the I/O Units into the I/O table memory
area of the CPU (see Section 3-3 IR Area). It also clears all I/O bits. The I/O
table must be registered before programming operations are begun. As the
I/O table remains in memory, a new I/O table must also be registered when-
ever I/O Units are changed.
Unlike the C500H and C1000H PCs, C200H memory is allocated to slots in
the CPU and Extension I/O Racks, so it is not necessary to register the I/O
table. Register the I/O table if you want an error to occur when I/O Units have
been added, removed, or replaced with another type.
I/O Table Registration can be performed only in PROGRAM mode.
The I/O verification error message, “I/O VER ERR”, will appear when starting
programming operations or after I/O Units have been changed. This error is
cleared by registering a new I/O table.
When the I/O table has not been registered, the PC will operate according to
the I/O Units mounted when power is applied. The I/O verification error will
not occur.
Key Sequence
Preparation for Operation Section 4-5
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