Skip to Content

support.automation.siemens.com | Technical Forum | Thursday, December 12, 2019 4:21:57 AM

Mapping Boolean Variables Into Holding Register Areas

Created by: the wicker man at: 9/16/2017 7:23 AM (6 Replies)

Rating (1)

Thanks 0

7 Entries

9/16/2017 7:23 AM	Rate (0)
the wicker man Regular Member Joined: 8/6/2015 Last visit: 9/21/2017 Posts: 10 Rating: (0)	Hello everyone, I need to map my boolean data variables into Holding registers. Is that possible? For example I have 16 boolean data and I want to write them into address: 40001 bit 0 40001 bit 1 .... 40001 bit 15 Best regards, Burak

Suggestion To thank Quote Answer

9/16/2017 1:50 PM	Rate (1)
Kaulquappe Platinum Expert Joined: 11/27/2007 Last visit: 9/13/2019 Posts: 3093 Rating: (311)	Hello Burak, yes, this is possible. Regards, Kaulquappe

Suggestion To thank Quote Answer

9/16/2017 2:12 PM	Rate (0)
the wicker man Regular Member Joined: 8/6/2015 Last visit: 9/21/2017 Posts: 10 Rating: (0)	Dear Kaulquappe, I cannot find the way to assign boolean variables into Holding Register Data Area. In the attached file you can see what I did so far. I assigned variables into Input Status data area. I cannot find a way to assign any variable into any bit of a holding register. Can you lead me? Best regards, Burak Attachment address assignement.PNG (43 Downloads)

Suggestion To thank Quote Answer

8/29/2019 3:36 PM	Rate (0)
Cheese11 Regular Member Joined: 8/28/2011 Last visit: 11/14/2019 Posts: 5 Rating: (0)	Hello Kaulquappe, Can you tell me how I can map boolean into a holding register? I am operating as a modbus server. I have some booleans that the client have to be read out of my holding register, addresses 1-99 (function code 1). But also some booleans that have to be written to by the client, addresses 200-208 (function code 15). It is not clear for me if it is possible to put boolean into a holding register? Or do it always have to be a WORD? Addresses 100-199 are real variables(1 dec.) that is written to (function code 15). I suppose that I have to multiply these by 10 and then write into a word in the holding register, am I right? Hopefully you can help me! Thanks in advance!

Suggestion To thank Quote Answer

8/29/2019 4:33 PM	Rate (0)
AQ-Bor Member Joined: 1/7/2016 Last visit: 9/4/2019 Posts: 3 Rating: (0)	Dear Kaulquappe, Can You Please tell us how? also for S7-1200 please thank you in advance!!
	Last edited by: AQ-Bor at: 08/29/2019 16:35:15
Suggestion To thank Quote Answer

8/30/2019 6:34 AM	Rate (0)
Cheese11 Regular Member Joined: 8/28/2011 Last visit: 11/14/2019 Posts: 5 Rating: (0)	Sorry, forgot to mention, but I am using a S7-1500 PLC (1516-3 PN/DP). Kind regards!

Suggestion To thank Quote Answer

8/30/2019 8:16 AM	Rate (0)
Duris_I Platinum Expert Joined: 4/28/2015 Last visit: 12/11/2019 Posts: 6036 Rating: (445)	Hello Cheese, sry but I see some missunderstandings about Modbus as is from your post. Pls check some Modbus documentation for first, especially FC codes and data collection system due this FC. Holding register is defined for other data as Boolean area (Read/Write) is defined. I don't recommend use Holding Register for that, your Partner have for this Boolean area FC1,FC15 f.ex. Maybe you can better explain your task with better knowledge of MB of course. I recommend Smiffy's Topic here on Forum or www.simplymodbus.ca for read this problematic.
	With kind regards... Duris_I
Suggestion To thank Quote Answer