α2 Simple Application Controllers |
Computer Link - Dedicated Protocol 5 |
5.Computer Link - Dedicated Protocol
The α2 Series Controller can transfer data To/From a personal computer, HMI, or other peripheral equipment via Dedicated Protocol. The structure of the α2 Series computer link protocol is based upon 8-bit binary interpretation and not an ASCII coded string.
5.1Data Flow by Link
The computer reads data from the α2 Series Controller
Computer |
RS-232 |
AL2-GSM-CAB |
FBD |
α2 Controller |
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RS-232 |
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(2) Cross cable |
(3) |
(4) |
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OS |
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(9) |
(8) |
(7) |
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(1) |
(10) |
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Data(6) |
(5) |
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Communication |
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Device |
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Read |
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OS |
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Program |
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Memory |
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S
(1) Request Command T X
(2)RS-232 Cross Cable Connection
(3)AL2-GSM-CAB Cable Connection
(4)α2 Controller RS-232 Interface
Read
(5) Operating System → Device Memory
Data
(6)Device Memory → Operating System
(7)α2 Controller RS-232 Interface
(8)AL2-GSM-CAB Cable Connection
(9)RS-232 Cross Cable Connection
E
(10) Response Data T X
5 - 1
α2 Simple Application Controllers |
Computer Link - Dedicated Protocol 5 |
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The computer writes data to the α2 Series Controller |
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Computer |
RS-232 |
Al2-GSM-CAB |
FBD |
α2 Controller |
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RS-232 |
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(2) Cross cable |
(3) |
(4) |
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OS |
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(8) |
(7) |
(6) |
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(1) |
(9) |
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(5) |
Communication |
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Device |
Write |
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OS |
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Program |
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Memory |
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S
(1) Request Command T X
(2)RS-232 Cross Cable Connection
(3)AL2-GSM-CAB Cable Connection
(4)α2 Controller RS-232 Interface
Write
(5)Operating System → Device Memory
(6)α2 Controller RS-232 Interface
(7)AL2-GSM-CAB Cable Connection
(8)RS-232 Cross Cable Connection
(9)Acknowledge Command
The 8-bit binary computer link string is sent from peripheral equipment to the α2 Series Controller using a combination of a AL2-GSM-CAB and user-made cross-cable. The Transmit message consists of either Format A or Format B. Refer to section 5.3 for further outline information. The reply generated from the α2 Series Controller informs the user of the status of the communication line, erroneous messages, status of function block bit data, status of function block word data and the status of the Time Switch settings.
Accessible devices include: System Bits, Input/Output Terminals, Key Inputs, Link Inputs/ Outputs, Analog Inputs and Control (N) bits. Additional parameters must be entered for information exchange with Function Block data (Bit or Word) to be enabled.
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