IMO i3N Series, Руководство пользователя

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CHAPTER 5: REGISTERS
5.1 Register Definitions
When programming the I3N, 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.
Below is a table of the type of registers found in the I3N unit.
Table 5.1—Types of Registers
Register Description
%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
voltages, levels, or speed settings to an attached device.
%AIG Global Analog Input Specially defined 16-bit input registers that come from the network.
%AQG Global Analog Output
Specially defined 16-bit output registers that go to the network.
%D Display Bit*
These are digital flags used to control the displaying of screens on a
unit which can 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.
%IG Global Digital Input Specially defined single-bit inputs that come from the network.
%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.
%QG Global Digital Output
Specially defined single-bit outputs that go to the network.
%R General Purpose Register
Retentive 16-bit registers.
%S System Bit Single-bit coils predefined for system use.
%SR System Register 16-bit registers predefined for system use.
%T Temporary Bit Non-retentive single-bit registers.
* Not supported by I3N Units.