MAN1256-05-EN_EXLW_XLWP_UM
November 10, 2021
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CHAPTER 6: REGISTERS
6.1
Register Definitions
When programming the EXLW/XLW PRIME OCS, data is stored in memory that is segmented
into different types. This memory in the controller is referred to as registers. Different groups
of registers are defined as either bits or words (16 bits). Multiple registers can usually be used
to handle larger storage requirements. For example, 16 single-bit registers can be used to store
a word, or two 16-bit registers can be used to store a 32-bit value.
Table 6.1 - Types of Registers found in the EXLW/XLW PRIME OCS
%AI = Analog Input
16-bit input registers used to gather analog input data such as voltages,
temperatures, and speed settings coming from an attached device.
%AQ = Analog Output
16-bit output registers used to send analog information such a voltages,
levels or speed settings to an attached device.
%D = Display Bit
These are digital flags used to control the displaying of screens on a
unit which has the ability to display a screen. If the bit is SET, the screen
is displayed.
%I = Digital Input
Single-bit input registers. Typically, an external switch is connected to
the registers.
%K = Key Bit
Single-bit flags used to give the programmer direct access to any front
panel keys appearing on a unit.
%M = Retentive Bit
Retentive single-bit registers.
%Q = Digital Output
Single-bit output registers. Typically, these bits are connected to an
actuator, indicator light or other physical outputs.
%R = General Purpose
Register
Retentive 16-bit registers.
%S = System Bit
Single-bit bit coils predefined for system use.
%SR = System Register
16-bit registers predefined for system use.
%T = Temporary Bit
Non-retentive single-bit registers.
