Programming manual M238 | 3 MB - BERGER - POSITEC

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Tasks Freewheeling Task A Freewheeling task does not have a fixed duration. In Freewheeling mode, each task scan begins when the previous scan has been completed and after a short period of system processing. Each Freewheeling task type executes as follows: Event Task 1. Read Inputs: The physical input states are written to the %I input memory variables and other system operations are executed. 2. Task Processing: The user code (POU, etc.) defined in the task is processed. The %Q output memory variables are updated according to your application program instructions but not yet written to the physical outputs during this operation. 3. Write Outputs: The %Q output memory variables are modified with any output forcing that has been defined; however, the writing of the physical outputs depends upon the type of output and instructions used. For more information on defining the Bus cycle task, refer to the CoDeSys part of the SoMachine online help and Modicon <strong>M238</strong> Logic Controller Settings (see page 69). For more information on I/O behavior, refer to Controller States Detailed Description (see page 49). 4. System Processing: The controller OS carries out system processing and any other lower priority tasks. The length of the system processing period is set to 30% of the total duration of the 3 previous operations (4 = 30% x (1 + 2 + 3)). In any case, the system processing period won’t be lower than 3 ms. This type of task is event-driven and is initiated by a program variable. It starts at the rising edge of the boolean variable associated to the trigger event unless preempted by a higher priority task. In that case, the Event task will start as dictated by the task priority assignments. For example, if you have defined a variable called my_Var and would like to assign it to an Event, select the Event type on the Configuration sub-tab and click on the Input Assistant button to the right of the Event name field. This will cause the Input Assistant dialog box to appear. In the Input Assistant dialog box, you navigate the tree to find and assign the my_Var variable. 36 EIO0000000384 04/2012
Tasks External Event Task This type of task is event-driven and is initiated by the detection of a hardware or hardware-related function event. It starts when the event occurs unless preempted by a higher priority task. In that case, the External Event task will start as dictated by the task priority assignments. For example, an External Event task could be associated with an HSC Threshold cross event. To associate the HSC4_TH3 event to an External Event task, select it from the External event dropdown list on the Configuration sub-tab. Depending on the related product, there are up to 2 types of events that can be associated with an External Event task: Rising edge on Fast input (%IX0.0 ... %IX0.7 inputs) HSC thresholds EIO0000000384 04/2012 37
Page 1 and 2: EIO0000000384.04 Modicon M238 Logic
Page 3 and 4: Table of Contents Safety Informatio
Page 5 and 6: Chapter 16 Loader Device Accessory
Page 7 and 8: Important Information NOTICE Safety
Page 9 and 10: At a Glance Document Scope Validity
Page 11 and 12: Product Related Information User Co
Page 13 and 14: Modicon M238 Logic Controller M238
Page 15 and 16: Modicon M238 Logic Controller How t
Page 17 and 18: Device Tree How to Configure the Co
Page 19 and 20: Libraries Introduction Modicon M238
Page 21 and 22: Modicon M238 Logic Controller Suppo
Page 23 and 24: Introduction Modicon M238 Logic Con
Page 25 and 26: Customer Area 1000 kbytes TM238LDD2
Page 27 and 28: System Variables Library Sizes Memo
Page 29 and 30: Memory Mapping Relocation Table Edi
Page 33 and 34: Task Configuration Screen Tasks Scr
Page 35: Task Types Introduction Cyclic Task
Page 39 and 40: Task Priorities Introduction Tasks
Page 41 and 42: Default Task Configuration Tasks De
Page 45 and 46: Note 1 Note 2 Note 3 Note 4 Note 5a
Page 47 and 48: Note 8 Note 9 Controller States and
Page 49 and 50: 7.2 Controller States Description C
Page 51 and 52: Controller States and Behaviors Tas
Page 53 and 54: 7.3 State Transitions and System Ev
Page 55 and 56: Controller States and Behaviors Ini
Page 57 and 58: Commanding State Transitions Run Co
Page 59 and 60: Reset Cold Reset Origin Controller
Page 61 and 62: Controller States and Behaviors 9.
Page 63 and 64: Error Detection, Types, and Managem
Page 67 and 68: Tab Descriptions Controller Device
Page 69 and 70: PLC Settings Overview The figure be
Page 71 and 72: Services Services Tab The Services
Page 73 and 74: Overview Modicon M238 Logic Control
Page 75 and 76: M238 Embedded Functions HSC Configu
Page 77 and 78: M238 Embedded Functions I/O Configu
Page 79 and 80: Configuration Parameters For each d
Page 81 and 82: M238 Embedded Functions PTO_PWM Con
Page 83 and 84: Modicon M238 Logic Controller Expan
Page 85 and 86: Modicon M238 Logic Controller CANop
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CANopen Configuration CANopen Opera
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Overview Modicon M238 Logic Control
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General Functional Description AS-I
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The following table describes the d
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Add an AS-Interface Master Module I
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Configure an AS-Interface Master In
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Tab Name Configuration Window Descr
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Step Action AS-Interface Configurat
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AS-Interface Configuration Add a Sl
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Configure an AS-Interface Slave Int
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AS-Interface Configuration The tabl
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Modification of Slave Address At a
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Step Description AS-Interface Confi
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AS-Interface Configuration Diagnost
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Diagnostic of AS-Interface Slave De
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Configuration of a Replaced AS-Inte
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Introduction Modicon M238 Logic Con
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Step Action 3 Click the Physical Se
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Serial Line Configuration The follo
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Configure the Manager To configure
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SoMachine Network Manager Introduct
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Modbus IOScanner Introduction Seria
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Adding a Device on the Modbus IOSca
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Step Action To configure the Modbus
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Step Action To configure your Modbu
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Serial Line Configuration These scr
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Modbus Manager Introduction Serial
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Modbus Master Modbus Slave Serial L
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Adding a Modem Serial Line Configur
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Modicon M238 Logic Controller Ether
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Step Action Comment 3 Select 499TWD
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Step Action Comment 3 Enter the val
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Introduction Modicon M238 Logic Con
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M238 - Connecting the Modicon M238
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Active Path of the Controller Intro
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Loader Device AccessoryDescription
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Physical Description Overview 1 Bat
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LED Status and Diagnostic LED Statu
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Firmware and SoMachine Software Com
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Loader Device Accessory 16.2 Upload
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Upload From the Controller to the U
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Interrupting a download can erase t
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16.4 Other Functionalities What’s
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Update the Firmware of the Loader D
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Page 183 and 184:
Updating the firmware requires one
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Updating Through USB Introduction U
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Launching the Exec Loader Wizard In
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Step 2 - Settings Selecting Setting
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Step 3 - File and Device Exec Prope
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Step 4 - Transfer Progress Overview
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Modicon M238 Logic Controller Modic
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Check Action Resolution: Modicon M2
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Modicon M238 Logic Controller - Tro
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Modicon M238 Logic Controller - Tro
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Frequently Asked Questions Modicon
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ASI_CmdSetAutoAddressing AS-Interfa
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ASI_CmdSetDataExchange Description
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ASI_CmdSetOfflineMode Description G
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ASI_MasterStatusCheck Description G
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ASI_SlaveAddressChange Description
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ERROR: Detected Error Codes The ERR
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The following table describes the o
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Output Type Comment LAS ARRAY[0..7]
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The following table describes the o
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How to Use a Function or a Function
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Step Action Function and Function B
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Function and Function Block Represe
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SetSerialConf: Change the Serial Li
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Functions to get/set serial line co
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Modicon M238 Logic Controller M238
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application source ARP ASCII BOOTP
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controller cyclic task data log DHC
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Flash Memory FTP function block Glo
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LD located variable MAC address MAS
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periodic execution persistent data
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SDO sequential function chart See S
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Modicon M238 Logic Controller Index
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Programming manual M238 | 3 MB - BERGER - POSITEC

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