ALPHA-VISION® content: SoftPlc7Net.dll

SoftPlc7Net.dll

SUMMARY

CONTENTS

1. Introduction
2. Configuration
3. Server connections
4. P_SND_RK and P_RCV_RK
5. Diagnosis
6. Redundance
7. SoftPLCNet.ini
8. SoftPLC7.ini

In principle any (S)FC and (S)FB can be replaced by any HLL-Function with appropriate parameters. The settings therefore are made in the SoftPLC7.ini file. If entry’s for SFBs are missing the standard functions of SoftPLCNet.dll are used as a default. The functions FC5, 6, 50 and 60 will not be replaced automatically, since they not necessarily comply with the PLC functions. In that case a manual entry must be made.

The connections for communication between the original Simatic S7 must be investigated and the SoftPLC7s must be set up accordingly.
The parameters must be defined in the SoftPLCNet.ini file.
For the connections it must be distinguished between the standard send/receive interface, the special SHM-Interface and the UDP-Interface. To use the send/receive interface “ISO Ind. Ethernet” must be defined as the interface to be used.
After restoring a snapshot all connections are resetted.

Contrary to the functions PLC_(L)SEND, PLC_(L)RECV or BSEND,BRCV the functions GET, PUT, STATUS and USTATUS has to be executed asynchronously. In the remote PLC there is no equivalent to the call PLC_(L)RECV or BRCV; incoming telegrams are analyzed and answered telegrams are send back, on which the local PLC reacts. To start the server functionality the SoftPLC7.ini file must be amended in the section [Plugin-Functions] - see below.

For simulation of a CP341 the HLL-Functions “PRCV_RK” and P_SND_RK” are available to replace FB7 and FB8 out of the SIMATIC-Library “CP Ptp”. The only driver supported is the ASCII-driver. No control signals like RTS/CTS are send, the end of a telegram is recognized by an adjustable ‘no data’ gap.
Communication is done via a RS-232-Interface. To use a RS-485-Interface an Interface-Converter is needed; it must be configured for 2 wires and self-controlling.

Via the pull-down menu ‘Extras’, item ‘Connections..’ all connections defined for the SoftPLC7 can be inspected. The last 2 columns show the total amount of send and received bytes since program start and they are still updated when watching.

When using the SHM-Interface, also redundant connections can be created.

Example:
CPU1 and CPU2 got 2 CPs each. The addresses are 0x1000, 0x1100 (CPU1) and 0x2000, 0x2100 (CPU2).
Data should be send redundant by FC50 from CPU1 to CPU2.
The SoftPlcNet.ini configurations of the SoftPLC7s might look alike:

[Settings]
LAddr1=1000
LAddr2=1100
[SR-Connections]
Con_1=(1;2;AG1;AG2;n;1; ;2000)
Con_2=(1;2;AG1;AG2;n;2; ;2100)
			  

[Settings]
LAddr1=2000
LAddr2=2100
[SR-Connections]
Con_1=(1;2;AG2;AG1;n;1; ;1000)
Con_2=(1;2;AG2;AG1;n;2; ;1100)
			  

Packages send by CPU1 via AG_LSEND(ID=1, LADDR=W#16#1000) are received by CPU2 via AG_LRECV(ID=2,LADDR=W#16#2000).
Packages send by CPU1 via AG_LSEND(ID=1, LADDR=W#16#1100) are received by CPU2 via AG_LRECV(ID=2,LADDR=W#16#2100).

Sending packages via a connection with a remote LAddr<>0 defined are accepted remotely only if there no LAddr-Index is specified, or the specified one match's the ‘remote LAddr’ exactly.
Sending packages via a connection with no specific remote LAddr (LAddr=0) defined are accepted at the remote end if just the local Conn_Id match's.

If the functions GET, PUT, STATUS and USTATUS to be used on redundant communication with a remote LAddr defined, the corresponding Server-Connections pointing to that LAddr must be created.
On CFB, BSEND and BRCV the remote LAddr is not checked, since the R_ID is unique.

INI-FILES

Section [Startup]

Section [Settings]

Section [SR-Connections]

Section [Run]

Section [Interface]

Section [ComDriver<n>]

Section [HLL-Functions]

FC13=MyDll, MyFunction
				

FB7=SoftPlcNet,P_RCV_RK
FB8=SoftPlcNet,P_SND_RK
			        

Section [Plugin-Functions]

Func1=S7Sync,S7SyncControl
				

Func1=SoftPlcNet,ProcessSharedMemory   ;if  shared memory interface is used
or
Func1=SoftPlcNet,ProcessSendRecv       ;if Send/Recv interface is used