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2 Simple Application Controllers
Computer Link - Dedicated Protocol 5
5 - 2
The computer writes data to the
α
2 (AL2-14MR-*, AL2-24MR-*) Series Controller
The 8-bit binary computer link string is sent from peripheral equipment to the
α
2 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
α
2 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.
OS
Communication
Program
(1) (9)
α
2 Controller
OS
Device
Memory
(4)
FBD
RS-232
(6)
(5)
Write
(2)
(8)
(3)
(7)
RS-232
Cross cable
AL2-GSM-CAB
Computer
(1) Request Command
S
T
X
(2) RS-232 Cross Cable Connection
(3) AL2-GSM-CAB Cable Connection
(4)
α
2 Controller RS-232 Interface
(5) Operating System
→
Device Memory
Write
(6)
α
2 Controller RS-232 Interface
(7) AL2-GSM-CAB Cable Connection
(8) RS-232 Cross Cable Connection
(9) Acknowledge Command