Horner-apg XL7 OCS Manual de usuario descargar pdf (Pagina 74)

XL7 User Manual

CHAPTER 14: REGISTERS

14.1 Register Definitions

When programming the XL7 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 14.1 - Types of Registers found in the XL7 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

14.2 Useful %S and %SR registers

Table 14.2 – Common %S Register Definitions

Description

%S1

Indicate First Scan

%S2

Network is OK

%S3

10mS timebase

%S4

100mS timebase

%S5

1 second timebase

%S6

I/O is OK

%S7

Always ON

%S8

Always OFF

%S9

Pause 'n Load soon

%S10

Pause 'n load done

%S11

I/O being forced

%S12

Forcing is enabled

%S13

Network I/O is OK

%S16

Ethernet COM module is OK

Table 14.3 – %SR Registers

Name

Description

Min Val

Max Val

%SR1

USER_SCR

Current User Screen Number

1023

%SR2

ALRM_SCR

Current Alarm Screen Number (0=none)

1023

%SR3

SYS_SCR

Current System Screen Number (0=none)

%SR4

SELF_TEST

Bit-Mapped Self-Test Result

65535

%SR5

CS_MODE

Control Station Mode (0=Idle, 1=Do I/O, 2=Run)

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