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Advantech AE Technical Share Document Date 2016 / 12 / 15 SR# 1-2745780431
Category ■ FAQ □ SOP Related OS Microsoft Windows7
Abstract WebAccess SCADA connects to Siemens S7-1200 PLC
Keyword WebAccess, Siemens S7-1200 PLC
Related Product Siemens S7-1200 FW 4.0 and above
Description:
This document teaches user how to connect WebAccess SCADA to Siemens S7-1200 PLC. In order to
achieve this request, user has to use TIA Portal V13
Solutions:
1. To communicate with Siemens S7-1200 PLC, user has to modify PLC configuration in Simatic S7 TIA Portal
V13.
2. Move mouse cursor over PLC (e.g. PLC_1[CPU 1212C AC/DC/Rly]) and then click right button of mouse ->
select ”Properties”
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3. PLC_1 dialog box pops up
General -> Protection -> put tick in “HMI”, “Read” and “Write” in Full Access.
Keep going to “Connection mechanisms” function
Put tick in “Permit access with PUT/GET communication….”, then click “OK” button
4. Click “PLC_1[CPU 1212C AD/DC/Rly]
Next, move mouse cursor over PLC network connector (step 2), then click right button of mouse and select
“Properties”. Remove the tick in “Use Router” and make sure “Set IP Address in the project” is ticked.
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5. Last and most important step, download program and reboot the Siemens S7-1200 PLC so all
configurations will be valid after reboot.
6. Four tags already exist in S7-1200 PLC
PLC tags -> Show all tags
Tag Name Data Type Address
Tag_1 Bool %I0.4
Tag_2 Bool %Q0.3
Tag_3 Bool %M0.4
Tag_4 Uint %MW0
7. WebAccess Tag configuration for Tag_1 %I0.4 address:
Address: IX000
Conversion Code: Unsigned Integer
Start Bit: 4
Length: 1
8. WebAccess Tag configuration for Tag_2 %Q0.3 address:
Address: QX000
Conversion Code: Unsigned Integer
Start Bit: 3
Length: 1
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9. WebAccess Tag configuration for Tag_3 %M0.4 address:
Address: MX000
Conversion Code: Unsigned Integer
Start Bit: 4
Length: 1
10. WebAccess Tag configuration for Tag_4 %MW0 address:
Address: MW000
Conversion Code: Unsigned Integer
Start Bit: 0
Length: 16
11. For tags in Program Blocks, user has to enable “offset” in block because WebAccess tag address is based on
block number with offset
12. Move mouse cursor to block (E.g. Data_block_4[DB4]), and click right button of mouse, then select
“Properties”
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“Data_block_4[DB4] property dialog box popup.
Attributes -> uncheck “Optimized block access” -> click “OK” button
Click right button of mouse -> Show/Hide -> check “Offset”
“Offset” option will appear in the list.
13. TIA Portal V13 block with Array:
WebAccess tag address has to choose DBW for Word data type
To read PLC DB1 DBW[4], WebAccess tag address will be: DBW1,8
- 1 means DB1 block
- 8 means Offset
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14. PLC Block without array (Data_block_4 [DB4]):
Tag Name Data Type Offset
A1 Word 0.0
A2 Int 2.0
15. To read PLC DB4 A1 (WORD type), WebAccess tag address will be:
Address: DBW4,0
Conversion Unsigned Integer
16. To read PLC DB4 A2 (Integer type): WORD type, WebAccess tag address will be:
Address: DBW4,2
Conversion Code: Signed Integer
