Navigation

S7-300, CP340

Created by: Subhash Agrawal at: 2/3/2011 11:57 AM (2 Replies)

Rating (0)

Thanks 1

3 Entries

2/3/2011 11:57 AM

Rate (0)

Subhash Agrawal

Posts: 8

Rating:

(0)

Dear Sir,

We have designed a system for EMS (Energy Management System) which fetches data from Conzerve EM6400 (Qty: 100) meter and display it on SCADA (Wincc). Our system consists of CPU 315-2 PN/DP with CP 340(RS222/RS485) and 14 different remote systems that consist of IM 153-4 PN with CP 340. 100 meter has been divided into groups with respect to their area and is connected through each other with modbus which are finally connected to CP card at remote station of that area. These remote stations are connected through optical cable and then thorough LAN to PLC.

The problem is that while receiving data from meters of two remote station having 21 and 18 meters respectively, the network gets hang and the values stop receiving/updating. In our logic polling continues but if we physically check the CP card then transmit and receive led does not glow. If we check the diagnostic buffer of CP card then we get no error message and it shows “Device available and OK”.

In software to receive data from CP card we are using FB2 and FB3, that is standard block for CP transmit and receive. When our data don’t update, at that time we do not receive either of ERROR_RX, NDR_RX, DONE_TX bit. We are also using standard block FB12 (P_RESET) for CP reset but still the problem remains. When we power OFF and ON of CP card at remote station then, the system becomes healthy both light of transmit and receive starts glowing. We also start receiving data but it may be for 1 hour, 10 hours or 1 day.

Also provide the details of CP reset block if it is one of the solution because we have doubt of its functioning properly in our logic.

NAME OF STATION	IP ADDRESS	NO. OF METERS
HANGER-1	192.168.0.1	21
HANGER-2	192.168.0.2	4
HANGER-3	192.168.0.3	12
CANTEEN	192.168.0.4	2
STORE	192.168.0.5	3
ADMIN	192.168.0.6	4
VE BUILDING	192.168.0.7	3
MVC	192.168.0.8	4
STP	192.168.0.9	7
HT	192.168.0.10	18
MRS	192.168.0.11	15
DG	192.168.0.12	6
33 KV	192.168.0.13	2
UGR	192.168.0.14	1

Note: Mainly we are facing problem in HT and HANGER-1 group.

2/4/2011 8:43 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/20/2025 Posts: 3042 Rating: (1061)	Hello Subhash Agrawal the one thing that sticks out from your very detailed description is that the CP340's with the most connected devices seem to the worst affected. Due to the number of devices connected to each, they'll most likely also have the longest serial cable runs (this is an assumption) andI wonder if perhaps you pick up some interferencewhich leads to the lock up of the CP340 comms. Worthwhile checking anyhow that teh serial cabel is installed away from motor and power cables and the likes. The other thing to check is how you handle the communication calls. You will (presumably) have at least 14 FB2&3 calls in your logic (one per CP340, I presume that you multiplex eachFB2&3 callper CP 340 to read/write from each device connected to that CP, corrrect?). My question is if you call alleach of the 14 FB2&3 pairs (one FB2&3 pair per CP340) independently of each other and without regards to each? If so, please be aware that FB2 (P_RCV) uses SFB52 (RDREC) and that FB3 (P_SEND) uses SFB53 (WRREC) and that the restrictions from the FAQ below apply (i.e. you will may need to cut the number of simultaneously active FB2&3 callsdown to only 4 for your 315): What restrictions are there for active jobs when communicating with SFC 58 / SFC 59 and SFB 52 / SFB 53 via PROFIBUS DP and PROFINET IO? I hope this helps and please let us know what you find.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
Suggestion To thank Quote Answer

2/4/2011 12:24 PM	Rate (0)
Subhash Agrawal Posts: 8 Rating: (0)	Dear Fritz Thanks for nice reply, We will follow as you told. As actually we are polling 5 CPs at a instant, so we will reduce it to 4 or 3 then try. We will come back after results. We have also noted that no done/error bit is received with calling/polling of Tx block FB2. When we reset the power the system starts working but after some time it again got hang. Thanks & regards Subhash Agrawal -- SUN SHINE AUTOMATION INDIA LTD. Website: www.ssail.in
Subhash Agrawal Posts: 8 Rating: (0)	Last edited by: O_Moderator at: 2/4/2011 12:53 PM contact data deleted
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users fritz

Share this page:

Share this page on...

SiePortal

S7-300, CP340

Created by: Subhash Agrawal at: 2/3/2011 11:57 AM (2 Replies)

Rating (0)

Thanks 1

3 Entries

Subhash Agrawal

fritz

Subhash Agrawal

Last edited by: O_Moderator at: 2/4/2011 12:53 PM

This contribution was helpful to

3 Entries

Follow us on

SiePortal

S7-300, CP340

Created by: Subhash Agrawal at: 2/3/2011 11:57 AM (2 Replies)

Rating (0) Thanks 1

3 Entries

Subhash Agrawal

fritz

Subhash Agrawal

Last edited by: O_Moderator at: 2/4/2011 12:53 PM

This contribution was helpful to

3 Entries

Follow us on

Rating (0)

Thanks 1