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Digital Electronics Corporation Serial Multilink Guide

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1Digital Electronics CorporationSerial Multilink Guide1About Multilink..................................................................................................................22Monopolize PLC...............................................................................................................33System Data Area Settings..............................................................................................44Multilink Settings..............................................................................................................55Customize Function.........................................................................................................76System Configuration.......................................................................................................97Communication Settings................................................................................................108Cable Diagrams.............................................................................................................139Internal Devices.............................................................................................................1410Error Messages..............................................................................................................1511Restrictions....................................................................................................................16Serial Multilink GuideGP-Pro EX Device/PLC Connection Manual21About MultilinkMultilink communication connects multiple Displays for direct access to a single External Device.This is done using a token ring network, where only one of multiple connected Displays has exclusive communication with the External Device at a time. The maximum cable extension length is 1000m, or the maximum length specified for the External Device, whichever is shorter.•Connect multiple Displays to a single External Device.Multiple Displays can be connected to a single link interface dedicated to each manufacturer's External Device. (You can connect a maximum of 16 Displays. However, for optimum performance, we recommend using a maximum of four Displays.)•Direct access communicationNo special program is required for multilink communication.•Connect without using specialized hardwareNo specialized hardware is required.•Large and small size Displays can be connected.Enables multilink communication with connections of large, medium, and small-size Displays (GP4000, GP3000, ST3000, LT3000, GP77R, GP2000, GLC2000, and ST400 Series).Multilink communication is available using WinGP.•For all connected Displays, set the same address of the same External Device under the multilink settings "Communication" option.•As the number of connected Displays is increased, the display and operation speeds for each Display will decrease. Please keep this in mind when designing your system.•To ensure performance for practical use, set consecutive addresses for Parts and any other features. If the those address settings are not consecutive, processing speed may decrease.•System response speed depends on the External Device’s scan time (cycle time).•If the power supply for the External Device is turned OFF during communication, a communication error may come up on the Display.•Use a conductive material to connect the FG terminal via a connector hood when Displays are connected to an External Device.•To set up the GP77R, GP2000, GLC2000, and ST400 Series, the GP-Pro PBIII C-Package is required.•Do not use the multilink system for an application that requires simultaneous operations. If you enter touch input simultaneously from multiple Displays, response speed may decrease because the External Device must respond to the first Display before it can respond to the following Displays.DisplaySerial communicationExternal DeviceDisplayDisplaySerial Multilink GuideGP-Pro EX Device/PLC Connection Manual32Monopolize PLC"Monopolize PLC" means that one of the connected Displays has exclusive control of the External Device.For example, when you enter data with a keyboard on the screen, use this function to show input/output data using a single Display.•How to enable the "Monopolize PLC" settingTo enable the "Monopolize PLC" setting, the following two methods are available:(1)Turn ON bit 7 of system data area LS0014 (Control) from an External Device or Display.(2)Set "Monopolize Touch Panel" to "Enable".•How to disable the "Monopolize PLC" settingTurn OFF the LS0014 (Control) bit 7 of the Display currently using the External Device.When the "Monopolize PLC" setting is enabled via the above method (1), you can specify how long the External Device will be exclusively used. After the set time elapses, the Monopolize setting will be automatically stopped.While a single Display monopolizes the External Device, bit 7 of system data area LS0006 (Status) on the other Displays is set to ON, and those Displays are on standby.If you enter requests from a Display that is on standby, the processing will be executed after the monopolize status is ended and communication with the Display on standby is restored. This may therefore result in malfunction, depending on the accumulated processing requests.The system data area bit status of a Display on standby cannot be monitored from an External Device. It is recommended that the Displays should indicate Monopolized status or Standby status on their screens.(Example: When bit 7 of the system data area LS0006 (Status) is defined as the start bit on a Display, a "Standby" message is indicated on the screen.•If multiple Displays have the LS0014 (Control) bit turned ON, the External Device is monopolized by the Display whose bit is turned ON first.•While a single Display monopolizes the External Device, the other Display screens are turned OFF.•The pass-through function can be used during multilink communication. Since a Display that uses the pass-through function monopolizes the External Device constantly, the other Display screens are turned OFF. ExclusivelyusedExternal DeviceStandbyStandbyStandbyLS0006LS0014150007LS0006LS0014150007LS0006LS0014150007LS0006LS0014150007System DataAreaSerial Multilink GuideGP-Pro EX Device/PLC Connection Manual43System Data Area SettingsMultilink communication uses a large volume of data for the overall system, because the number of system data areas to be assigned corresponds to that of connected Displays. This may result in slower processing speeds for the Displays.When you set up the system data area, it is recommended that you select only the required items.To show the GP-Pro EX system data area setting screen, from [System Settings] in the workspace, select [Display Unit], [System Area] tab.•Configure the system data area for each Display to be connected. Do not duplicate assigned External Device addresses on other Displays.•To increase the processing speed of each Display, you can leave some system data area items cleared as shown above. With those settings disabled, you cannot change a screen from the External Device that controls the Display, and the Monopolize PLC function is disabled.Serial Multilink GuideGP-Pro EX Device/PLC Connection Manual54Multilink SettingsMultilink settings are intended to verify the system configuration of connected Displays and to check if communication is operating normally. Set a communication information storage address and station number.4.1Communication information storage addressMultilink communication is executed based on the Communication settings. The Communication settings uses two word areas: Enabled Stations and Active Stations. These areas have specific roles. Data are assigned to the data register and data memory of the External Device.�Enabled StationsUse the Enabled Stations to register an External Device and the number of connected Displays in the External Device in advance. When a Display is connected to an External Device, a bit corresponding to the station number of the Display is turned ON.•A communication information storage address can be set only on an External Device that has been configured in the system area.•When you set a communication information storage address, specify the same address for all Displays connected to a External Device. If the External Device has two connection ports and several Displays are connected to each port, specify the same address for all connected Displays.•To stop a specific Display’s communication and switch to OFFLINE mode while connected to an External Device, turn OFF the bit corresponding to the station number of the Display.(Example)To connect four Displays (No. 0, No. 2, No. 3 and No. 5 units), write "002D(H)".•Before operation, be sure to set the Enabled Stations status bits.•Displays that are not connected should have their status bits set to OFF.•Do not turn OFF an Enabled Stations bit for a long period of time while the corresponding Display is being connected. Data register of External DeviceEnabled StationsActive Stations+0+1External Device�DisplayDisplay�External DeviceUnit 15Bit 15Bit 0Unit 14Unit 13Unit 12Unit 11Unit 10Unit 9Unit 8Unit 7Unit 6Unit 5Unit 4Unit 3Unit 2Unit 1Unit 00000000000101101EnabledStations002D(H)

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