GE 90-30/20/Micro User References

2-20 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K

User References

%R The prefix %R is used to assign system register references, which will store program

data such as the results of calculations.

%AI The prefix %AI represents an analog input register. This prefix is followed by the

value of one analog input or other value.

%AQ The prefix %AQ represents an analog output register. This prefix is followed by the

value of one anal og output or other value .

Note

%I The %I prefix represents input references. This prefix is followed by the reference’s

address in the input table (for example, %I00121). %I references are located in the input status

table, which stores the state of all inputs received from input modules during the last input

scan. A reference address is assigned to discrete input modules using the configuration software

or the Hand-Held Programmer. Until a reference address is assigned, no data will be received

from the module. %I data can be retentive or non-retentive.

%Q The %Q prefix represents output references. The coil check function of Logicmaster 90-

30/20/Micro software checks for multiple uses of %Q references with relay coils or outputs on

functions. Beginning with Release 3 of the software, you can select the level of coil checking

desired (SINGLE, WARN MULTIPLE, or MULTIPLE). Refer to the Logicmaster 90-

30/20Micro Programming Software User’s Manual, GFK-0466, for more information about this

feature.

The %Q prefix is followed by the reference’s address in the output table (for example,

%Q00016). %Q references are located in the output status table, which stores the state of the

output references as last set by the application program. This output status table’s values are

sent to output modules during the output scan.

A reference address is assigned to discrete output modules using the configuration

software or the Hand-Held Programmer. Until a reference address is assigned, no

data is sent to the module. A particular %Q reference may be either retentive or

non-retentive. *

%M The %M prefix represents internal references. The coil check function checks for multiple uses

of %M references with relay coils or outputs on functions. Beginning with Release 3 of the

software, you can select the level of coil checking desired (SINGLE, WARN MULTIPLE,

Manual, GFK-0466, for more information about this feature. A particular %M reference may

be either retentive or non-retentive. *

* Retentiveness is based on the type of coil. For more information, refer to “Ret entiveness of Data” on page 2-21.