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145Appendix D Logicmaster 90–70, Release 3: Remote Drop Configuration Instructions
Entering the Scanner’s Remote Drop ID
The Scanner’s Remote Drop ID is its remote drop communications ID. The range of
possible IDs is 16–254 The default is 16, which should initially appear in the REMOTE
DROP ID: field. Each remote drop in a serial communications network must have a
unique Remote Drop ID. When stored from Logicmaster 90–70, the default SNP ID
will be DROPxxx, where xxx is the Remote ID assigned from the screen illustrated
above. The Remote Drop ID should correspond to that entered during PLC
configuration. Consult the PLC printout.
If a Hand–held Monitor has previously been used to set up the remote drop, and an
SNP ID has been assigned, the default SNP ID will be DROPxxx, where xxx is the
remote ID assigned with the Hand–held Monitor. Unique ID numbers help avoid
confusion. See chapter 4 for more information.
Entering the Remote Drop’s I/O Configuration
The screen shows a beginning reference and length for:
%I discrete inputs
%Q discrete outputs
%AI analog inputs
%AQ analog outputs
For %I and %Q memory, the length shown is in bits (points). For %AI and %AQ
memory, the length shown is in words (each word is two bytes). The default length for
all four memory types is 0.
Specify a starting address and length for at least one memory type, as required for the
modules in the remote drop. Normally, these entries will match the starting address
and length entered when configuring the Series 90–70 PLC itself. Matching references
is highly recommended, since it will avoid confusion. As explained in chapter 3,
however, it is not absolutely necessary to match references. The appropriate
assignment of references will depend on the nature of the application.
Each remote drop can transfer up to 128 input bytes and 128 output bytes. These limits
reflect the maximum amount of data that can be sent on the Genius bus in a single
transmission. Each remote drop transfer any mix of discrete and analog inputs up to
128 bytes, and any mix of discrete and analog outputs up to 128 bytes. Bit memories
are assigned on byte boundaries. Reference limits for the Remote I/O Scanner are
listed below. Reference limits for the host may not be the same.
Memory Type References
Available
Maximum
Quantity
%I 12K up to 1024 bits
%Q 12K up to 1024 bits
%AI 8K up to 64 words
%AQ 8K up to 64 words
It is not necessary to allocate all four classes of I/O. To move on without assigning a
class, leave the length set to 0. The starting references associated with this class will
become meaningless (the display stays the same however). The same starting
reference will be usable in the next remote drop (or any other device).