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Questions about tag and DB

Created by: hyokoon at: 4/21/2009 3:43 AM (6 Replies)

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4/21/2009 3:43 AM	Rate (0)
hyokoon Posts: 14 Rating: (0)	Hi friends, I created a CFC chart with a FB of a motor inside. After compiling, downloading for both AS and OS, I saw in Tag Management there is a tag name MOTOR/TAG.EventState; Signed 32 bit value; DB64, DD0... My question are: - Where is DD0? I opened DB64 but I couldn't figure out where DD0 is, is it D130? - When does EventState change its value? Thank you
hyokoon Posts: 14 Rating: (0)
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4/21/2009 5:33 PM	Rate (0)
cumulus Posts: 993 Rating: (103)	Hi You mean DB64.DBD0? that means a DobbleWord at the DB64 staring by the Byte 0. the value of EventState is set by the Simatic Manager and should not change. regards cumulus
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4/22/2009 12:44 AM	Rate (0)
Phantom75 Posts: 2661 Rating: (279)	Hi hyokoon, EventState is a PCS7 structure tag common to all PCS7 (library) blocks. EventState ensures that all blocks follow a uniform status reporting structure. Each bit in the 32-bit word has particular significance and changes depending on incoming/outgoing events. See attachment for detailed bit assignment. Regards Attachment How to Insert a Group Display.pdf (522 Downloads)
Phantom75 Posts: 2661 Rating: (279)
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4/29/2009 9:51 AM	Rate (0)
hyokoon Posts: 14 Rating: (0)	Hi cumulus, Please look at the attached picture, you can see the infos of MOTOR/TAG.EventState. Attachment EventState.JPG (423 Downloads)
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4/29/2009 10:06 AM	Rate (0)
hyokoon Posts: 14 Rating: (0)	Hi cumulus, Attached file has the content of DB64. Could you please show me where is the value of EventState? I want to monitor the value of EventState but I can't figure out where it is in DB64. If we can't find it in DB64, is there any way to see its value? Hi phantom, thank for you explanation, it's helpful! Attachment DB64.pdf (331 Downloads)
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4/29/2009 10:51 AM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 1/14/2026 Posts: 12480 Rating: (2722)	Hello hyokoon; The tag Management page in WinCC uses a slight variation on the addressing compared to the structure used in Step 7, so it may be confusing at first. But DB64,DD0 in WinCC does refer to the PLC address DB64.DBD0, as stated earlier. Now, "DBD0" implies a double-word (32 bit value) starting at byte 0 of the datablock. It ocupies 4 consecutive bytes (of 8 bits each, total 32 bits), so it is comprised of byt 0, byte 1, byte 2 and byte 3 of the DB64. Your last posted attachment shows the first bytes of DB64. All the bits and bytesthat with addresses that start with 0, 1,2 and 3 are part of DBD0. Bit 0.1 is "Lock", and is one bit of the status DWord DBD0. (PLC address DB64.DBX0.1) Byte 2 is "QC_QStart_I" and represents one of the quality codes for one of the signals evaluated by DBD0. (PLC address DB64.DBB2) ... The DBD0 32-bit value is written as a single unit to the WinCC; in the DB64 it is shown with all its individual signals for the program to evaluate. Hope this helps, Daniel Chartier

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4/29/2009 11:40 AM	Rate (0)
CBo Gold Member Joined: 4/5/2006 Last visit: 10/3/2025 Posts: 917 Rating: (63)	Hi hyokoon, ".EventState" variable has not direct correlation with Instance Data Block (don't have same information in same order I menas). There is a good explanantion in "WinCC Information System" about GroupDisplay object (always linked to ".EventState" varable) WinCC Information System -> Working with WinCC -> Creating Process Pictures -> Working with Object in Object Palette -> Working with Smart Object -> How to Insert a Group Display Hope can help you Reagards Attachment EventState.zip (339 Downloads)

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