Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

Problem with AG_RECV

Created by: smiffy at: 12/18/2007 10:45 AM (1 Replies)

Rating (0)

Thanks 0

2 Entries

12/18/2007 10:45 AM	Rate (0)
smiffy Platinum Member Joined: 1/17/2007 Last visit: 3/17/2023 Posts: 1523 Rating: (518)	This is a copy of a post that I incorrectly posted in the Industrial Software forum. I should be deleted from that forum. Iam having problems with AG_RECVwhen using a word input as a database number. I have a block that has a database number as an input of type word, so that I can specify what database the AG_RECV is to put the received data into. So basically I have:- VAR_INPUT DB_NUM: WORD; END_VAR; I also have a datablock DB36 defined that is 16 bytes in length with a symbol name of R_DATA. During initial development, the data block washardcoded, withAG_RECV callis called as follows. AG_RECV(ID:=1,LADDR:=LADDR,RECV:=R_DATA,NDR:=NDR,ERROR:=ERROR,STATUS:=STATUS,LEN:=RXLEN); This works, and it received 16 bytes (the length of the datablock). This is correct as AG_RECV should receive the length of data comming in or the length of the destination datablock (which every is the largest). So now I tried to get it to use the DB_NUM input as the destination datablock. Firstly I tried:- AG_RECV(ID:=1,LADDR:=LADDR,RECV:=WORD_TO_BLOCK_DB(DB_NUM),NDR:=NDR,ERROR:=ERROR,STATUS:=STATUS,LEN:=RXLEN); But this gave a runtime error 8184H·Illegal data type specified for the RECV parameter. The documentation says that it must be aBYTE type. So attempt 2 was:- AG_RECV(ID:=1,LADDR:=LADDR,RECV:=WORD_TO_BLOCK_DB(DB_NUM).DB0,NDR:=NDR,ERROR:=ERROR,STATUS:=STATUS,LEN:=RXLEN); Butthis only received 1 byte. Attempt3 was to use anANY pointer. So added:- VAR_TEMP pRECDB:ANY; END_VAR; pRECDB := WORD_TO_BLOCK_DB(DB_NUM); AG_RECV(ID:=1,LADDR:=LADDR,RECV:=pRECDB,NDR:=NDR,ERROR:=ERROR,STATUS:=STATUS,LEN:=RXLEN); This gavetheruntime error 8184H again·Illegal data type specified for the RECV parameter. So attempt 4 was:- VAR_TEMP pRECDB:ANY; END_VAR; pRECDB := WORD_TO_BLOCK_DB(DB_NUM).DB0; AG_RECV(ID:=1,LADDR:=LADDR,RECV:=pRECDB,NDR:=NDR,ERROR:=ERROR,STATUS:=STATUS,LEN:=RXLEN); Butthis only received 1 byte again. Attempt 5 was to make the input parameter a BLOCK_DB type:- VAR_INPUT DB_NUM: BLOCK_DB; END_VAR; This failed compilation. ARRRGGGGHHHH! SCL is so inflexible, with 'c' I would have done it ages ago with no bother! So how can I get AG_RECV to receive the whole of the imcomming data whilst specifying the database number as an input parameter? (of type WORD or any other type, I'm not bothered as long as it works).
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
Suggestion To thank

12/19/2007 10:26 PM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 2/27/2023 Posts: 4097 Rating: (192)	closed cause question posted twice. The second thread with the subject Problems with AG_RECVis published within the conference STEP 7 / STEP 7 Lite Best regards CS Moderator
	Last edited by: O_Moderator at: 3/17/2010 11:22 AM conference-link edited My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
Suggestion To thank

|

Share this page:

Share this page on...

Follow us on