4

I/O Map

The I/O map represents the boundaries of the I/O references assigned to the remote drop which will be scanned by the central PLC. Before any modules are configured, the I/O map begins at the next available reference in each data type, based on the PLC configuration, and each reference type has a length of 0. You can change the reference starting addresses and enter lengths manually, or you can use automatic I/O mapping. The best method to use will depend on your application. If all I/O in the remote drop will be scanned by the central PLC and no future additions to the remote drop are planned, it is easiest to use automatic I/O mapping. However, if some I/O in the remote drop will not be scanned by the central PLC, you may prefer not to have the software automatically configure the I/O map. Details are on the following pages.

Ref Addr The beginning configured reference for each data type. Initially, the I/O map shows the next available reference in each data type, based on the PLC configuration. If Auto I/O Map is ON, the software ensures that all configured I/O will be scanned by the central PLC by adjusting the I/O map. The first configured I/O module of a given data type will have a starting reference offset that matches the offset of the I/O map.

Series Six or Series Five PLC: Reference Assignment You MUST use a Hand±held Monitor to change a Series Six or Series Five reference previously configured using either Logicmaster 90±70 or a Hand±held Monitor. You also must use an HHM to assign a reference in register (rather than I/O) memory. For a Series Six or Series Five PLC system that uses I/O table references, a previously±unconfigured Remote I/O Scanner will accept a reference entered here. It will be the reference for the first data type (in the sequence listed above) for which you enter a non±zero length. For example, if the remote drop has only analog input and output boards, the data lengths for %I and %Q would be 0. You would enter a data length for %AI and %AQ. The beginning reference entered for %AI would become the beginning Series Six or Series Five reference for the remote drop.

Length

The amount of data of each type to be exchanged with the PLC. For %I

 

and %Q memory, length is in bits (points). For %AI and %AQ

 

memory, length is in words (each word is two bytes). If Auto I/O Map

 

is ON, it is not necessary to enter lengths in the I/O map; within the

 

limits given below, the software will increment the lengths as you

 

configure I/O modules in the remote drop.

Data Length Limits Each remote drop transfers any mix of discrete and analog inputs up to 128 bytes, and any mix of discrete and analog outputs up to 128 bytes. These limits reflect the maximum amount of data that can be sent on the Genius bus in a single transmission. Bit memories (%I and %Q) are assigned on byte boundaries. Reference limits for the Remote I/O Scanner are listed below. Reference limits for the host may not necessarily be the same. Whichever is smaller determines the practical limits of the configuration.

Memory Type

References

Maximum

 

Available

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

Chapter 4 Configuration with Logicmaster 90±70

59

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GE GFK0579B user manual Map
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GFK0579B specifications

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