α2 Simple Application Controllers |
The Command String 7 |
7.6Commands
The following section will outline commands used to implement dedicated protocol with an α2 Series Controller.
Table 7.14: Dedicated protocol commands
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Command |
Description |
Section |
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Format A has limited operational functionary, however, |
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1) |
Communication Line Check |
checking the connection between the controller and the |
7.6.1 |
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personal computer is the primary aim. |
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2) |
Read Command |
The READ command is used to retrieve the status of |
7.6.2 |
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the intended internal device. Format B only. |
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3) |
Write Command |
The WRITE command is used to control the status of |
7.6.3 |
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the intended internal device. Format B only. |
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4) |
Run/Stop Command |
The RUN/STOP command is used to control the |
7.6.4 |
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operation of the controller. |
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The Time Switch command follows the same principle |
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5) |
Time Switch Command |
as the READ/WRITE commands in Format B, however, |
7.6.5 |
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a different structure is required due to the amount of |
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data needed to implement a setting change. |
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6) |
RTC Read Command |
The RTC Read Command is Read of Alpha 2 time, date |
7.6.7 |
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and RTC clock speed adjust value. |
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7) |
RTC Set Command |
The RTC Set Command is Set of Alpha 2 time, date and |
7.6.8 |
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RTC clock speed adjust value. |
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7 - 20
α2 Simple Application Controllers |
The Command String 7 |
7.6.1Communication Line Check
1 ) Command Specification Format A is shown.
Computer
α2 Controller
S |
No.comm |
bytes |
FormatNo. |
StationNo. |
E |
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N |
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X |
Q |
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03H |
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03 = 01 + 01 + 01 |
S |
No. comm |
bytes |
Format No. |
Station No. |
A |
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T |
C |
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X |
K |
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03H |
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03 = 01 + 01 + 01 |
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or |
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S |
No. comm |
bytes |
Format No. |
Station No. |
N |
Error Code |
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T |
A |
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X |
K |
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04H |
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04 = 01 + 01 + 01 + 01 |
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2 ) Command Example
Standard command for communication line check. This default command string can be used at any time for checking if dedicated protocol is possible. If no response is replied from the controller, check the communication settings, check cabling and check the command string
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X |
commNo. bytes |
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S |
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T |
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Com puter |
02H |
03H |
α2 Controller |
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No.
Station
No.
Format
40H 00H
E
N
Q
03H
X |
No.comm bytes |
S |
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T |
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02H 03H
No.
Station
No.
Format
40H 00H
A
C
K
06H
The received message shows that the communication line is fine.
7 - 21
α2 Simple Application Controllers |
The Command String 7 |
7.6.2Read Command
1 ) Command Specification Format B is shown.
Computer
α2 Controller
S T X
07HNo.commbytes |
FormatNo. |
StationNo. |
Command |
devicesofNo. |
codeDevice |
DeviceNo. (LB) |
DeviceNo. (HB) |
E |
checkSum |
(LB) |
checkSum (HB) |
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X |
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07 = 01 + 01 + 01 + 01 + 01 + 01 + 01 (bytes)
S T X
03HNo.commbytes |
Format No. |
Station No. |
Complete flag |
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03 = 01 + 01 + 01 (bytes)
or
S T X
05HNo.commbytes |
FormatNo. |
StationNo. |
Command |
devicesofNo. |
statusDevice |
E |
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05 = 01 + 01 + 01 + 01 + 01 |
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Sum check (LB) Sum check (HB)
S T X
commNo. bytes |
FormatNo. |
StationNo. |
N |
CodeError |
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A |
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K |
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04H |
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04 = 01 + 01 + 01 + 01 (bytes)
2 ) Command Example
a ) Read Status of Output O01 in Station 00.
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S |
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commNo. |
bytes |
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Format No. |
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Station No. |
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Command |
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ofNo. devices |
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X |
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Com puter |
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02H |
07H |
41H |
00H |
00H |
01H |
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α2 Controller |
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S |
commNo. |
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Format No. |
Station No. |
Complete flag |
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02H |
03H |
40H |
00H |
21H |
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Device code |
DeviceNo. |
(LB) |
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DeviceNo. (HB) |
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E |
checkSum |
(LB) |
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checkSum (HB) |
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X |
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42H |
01H |
00H |
03H |
85H |
00H |
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commNo. |
bytes |
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Format No. |
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Station No. |
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Command |
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S |
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ofNo. devices |
Device status |
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T |
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02H |
05H |
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41H |
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00H |
00H |
01H |
00H |
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E |
checkSum |
(LB) |
T |
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X |
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03H 42H
Sum check (HB)
00H
The received message shows that the Status of Output O1 is OFF.
7 - 22
α2 Simple Application Controllers |
The Command String 7 |
b ) Read the Status of the Delay FB Word parameters CWNo.5 and 6 as shown below. Refer to section 6.1 for more details concerning VLS settings for dedicated protocol bit/ word settings.
The following command string will use device code 69 (communication word CWNo. device code) to access parameters 5 and 6.
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S |
commNo. |
bytes |
FormatNo. |
StationNo. |
Command |
ofNo. devices |
Device code |
DeviceNo. (LB) |
DeviceNo. (HB) |
Device code |
DeviceNo. (LB) |
DeviceNo. (HB) |
E |
checkSum |
(LB) |
checkSum (HB) |
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T |
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T |
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X |
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Computer |
02H |
0AH |
41H |
00H |
00H |
02H |
69H |
05H |
00H |
69H |
06H |
00H |
03H |
20H |
01H |
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α2 Controller |
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S |
commNo. |
bytes |
FormatNo. |
StationNo. |
Complete flag |
T |
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X |
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02H 03H 40H 00H 21H
S |
commNo. |
bytes |
FormatNo. |
StationNo. |
Command |
ofNo. devices Device status Device status Device status Device status |
E |
checkSum |
(LB) |
checkSum (HB) |
T |
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T |
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X |
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X |
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02H 08H 41H 00H 00H 02H 32H 00H 0FH 00H 03H 84H 00H
The received message shows that
Parameter 5 00H (HB) 32H (LB) = 50 decimal Parameter 6 00H (HB) 0FH (LB) = 15 decimal
7 - 23