Library manual M238 system functions | 2 MB - BERGER - POSITEC

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M238 System Variables 1.1 System Variables: Definition and Use Overview This section defines System Variables and how to implement them in the Modicon M238 Logic Controller. What’s in this Section? This section contains the following topics: Topic Page Understanding System Variables 11 Using System Variables 13 10 EIO0000000364 04/2012
Understanding System Variables Introduction System Variables Naming Convention M238 System Variables This section describes how System Variables are implemented for the controller. These variables have the following attributes: System Variables allow you to access general system information, perform system diagnostics, and command simple actions. System Variables are structured variables conforming to IEC 61131 definitions and naming conventions. They may be accessed using the IEC symbolic name PLC_GVL. Some of the PLC_GVL variables are read-only (for example PLC_R), and some are read-write (for example PLC_W). System Variables are automatically declared as global variables. They have system-wide scope and must be handled with care because they can be accessed by any Program Organization Unit (POU) in any task. The System Variables are identified by: a structure name which represents the category of System Variable (e.g. PLC_R represents a structure name of read only variables used for controller diagnosis). a set of component names which identifies the purpose of the variable (e.g. i_wVendorID represents the controller Vendor ID). You can access the variables by typing the structure name of the variables followed by the name of the component. Here is an example of System Variable implementation: VAR myCtr_Serial : DWORD; myCtr_ID : DWORD; myCtr_FramesRx : UDINT; END_VAR myCtr_Serial := PLC_R.i_dwSerialNumber; myCtr_ID := PLC_R.i_wVendorID; myCtr_FramesRx := SERIAL_R[0].i_udiFramesReceivedOK; NOTE: The fully qualified name of the system variable in the example above is PLC_GVL.PLC_R.i_wVendorID. The PLC_GVL is implicit when declaring a variable using the Input Assistant, but it may also be entered in full. Good programming practice often dictates the use of the fully qualified variable name in declarations. EIO0000000364 04/2012 11
Page 1 and 2: EIO0000000364.06 Modicon M238 Logic
Page 3 and 4: Table of Contents Safety Informatio
Page 5 and 6: Important Information NOTICE Safety
Page 7 and 8: At a Glance Document Scope Validity
Page 9: Overview Modicon M238 Logic Control
Page 13 and 14: Using System Variables Introduction
Page 15 and 16: 1.2 PLC_R and PLC_W Structures Over
Page 17 and 18: %MW Var Name Type Comment 60024 i_w
Page 19 and 20: 1.3 SERIAL_R and SERIAL_W Structure
Page 21 and 22: SERIAL_W[0..1]: Serial Line Read /
Page 23 and 24: Overview Modicon M238 Logic Control
Page 25 and 26: GetBatteryLevel: Returns Remaining
Page 27 and 28: GetEventsNumber: Returns the Number
Page 29 and 30: Example M238 System Functions This
Page 31 and 32: GetLastStopCause: Returns the Cause
Page 33 and 34: GetLocalIOStatus: Returns the Embed
Page 35 and 36: GetPlcFault: Returns Detected Error
Page 37 and 38: M238 System Functions I/O Expansion
Page 39 and 40: Example M238 System Functions To ob
Page 41 and 42: M238 System Functions GetShortCutSt
Page 43 and 44: IsFirstMastCycle: Indicates if Cycl
Page 45 and 46: M238 System Functions IsFirstMastWa
Page 47 and 48: InhibitBatLowLed: Disables or Re-en
Page 49 and 50: SetRTCDrift: Adjust the Real Time C
Page 51 and 52: Overview Modicon M238 Logic Control
Page 53 and 54: PLC_R_STATUS: Controller Status Cod
Page 55 and 56: PLC_R_BOOT_PROJECT_STATUS: Boot Pro
Page 57 and 58: M238 PLC System Library Data Types
Page 59 and 60: 3.2 System Functions Data Types Ove
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M238 PLC System Library Data Types
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Page 65 and 66:
Page 67 and 68:
HOUR: SetRTCDrift Function Hour Par
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Modicon M238 Logic Controller EIO00
Page 71 and 72:
Overview Modicon M238 Logic Control
Page 73 and 74:
How to Use a Function or a Function
Page 75 and 76:
Function and Function Block Represe
Page 77 and 78:
How to Use a Function or a Function
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Function and Function Block Represe
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1-phase counter 2-phase counter BOO
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expansion bus E Glossary The expans
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Modbus NEMA PLC PLI POU PTO M The M
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U unlocated variable An unlocated v
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Modicon M238 Logic Controller Index
Page 91 and 92:
System Variable PLC_R, 16 PLC_W, 18
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Library manual M238 system functions | 2 MB - BERGER - POSITEC

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