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3. Implementation of the communication option cards
Ethernet card access to the Modbus server
With the VW3 A3 310 Ethernet card, access to address fields W40 ppp (values transmitted by the IO Scanner), W50 ppp"" (addresses
assigned to the IO Scanner) and W60 ppp"" (Ethernet parameters) is only possible by using a (UNIT_ID) address of 251 in your TCP/
Modbus requests.
E.g.,
(* Writing one of the ATV61 Ethernet card parameters *)
IF (NOT %MW810 :X0 AND %M65) THEN
%MW811 :3 :=0;
WRITE_VAR(ADR# {1.101} 6.0.251,'%MW', %MD2400, %MW2, %MW3000 :6,%MW810 :4);
RESET %M65;
END_IF;
In "ATV38 Interchangeability" mode (SE8 mode), it is still essential to use this new address in order to obtain access
to these fields, which had been available via address 0 with the VW3 A58310 Ethernet card. This address is no
longer used for this purpose on the Altivar 61’s VW3 A3 310 card.
Modbus functions available
The "Drive Identification" function on the VW3 A3 310 Ethernet card is incompatible with that on the VW3 A58310 Ethernet card.
Modification to be made in the context of upward compatibility
Function 65 (16#41) in the VW3 A58310 Ethernet card must be replaced by function 43 (16#2B), described in the "Drive
Identification" Request section, pages 32 and 36 in the VW3 A3 310 card Programming Manual.
This new function conforms to the Modbus protocol identification function and is used by the new products marketed by
Schneider Electric.
3. 10. 9. IO Scanning service
IO Scanning control
In order to imitate the Altivar 38’s behavior when a CNF fault is triggered by IO Scanning control ("freewheel stop" imposed by the drive),
you should configure it using the integrated display terminal, graphic display terminal or the PowerSuite software workshop.
In the
[1.8 - FAULT MANAGEMENT] (FLt-) menu, assign the value [Freewheel] (nSt) to the [Network fault mgt]
parameter in the [Com. Fault Mgt] (CLL) submenu.
In this way, when a CNF fault is triggered by IO Scanning control, the value of the CLL parameter will cause a freewheel stop.
Note: The CMD command word cannot be removed from the Altivar 38’s IO Scanner, and the check on writing of the CMD command word
by TCP/Modbus messaging does not apply to an Altivar 61 when it is used in "ATV38 Interchangeability" mode (SE8 mode).
Configuring the periodic parameter assignment table
If the Altivar 38’s VW3 A58310 Ethernet card uses periodic parameters configured by default (factory settings), it is still necessary to
configure the periodic parameter assignment table in the Altivar 61’s VW3 A3 310 Ethernet card since, by default, only the first two input
periodic parameters (CMD and LFRD) and the first two output periodic parameters (ETA and RFRD) are the same as those on the Altivar
38’s VW3 A58310 Ethernet card.
Configuration is performed either by TCP/Modbus messaging, or from the "IO Scanner" page of the standard HTTP server (see below), or
using PowerSuite.