Information to PLC

Tool change

With every programmed T<i> or #TOOL PREP, the CNC communicates the tool number to the PLC during NC program decoding, provided this function is activated in the channel parameter list (P-CHAN-00087).

This advance information can be used by the external tool management system to prepare a tool change (cleaning the tool, turning the disk changer, etc.) to save time.

The following data (CNC_TOOL_ID) is transferred in the request from the CNC to the PLC; the T number is entered in the basic element:

basic	: DINT;
sister	: DINT;
variant	: DINT;
sister_valid	: BOOL;
variant_valid	: BOOL;

The PLC must acknowledge receipt by returning the identical message.

Information to PLC 1: — Advance information about tool change to the PLC

Programming Example

Tool manager in the PLC program

...

(* CNC communicates tool change T<i> (during program decoding) *)

ELSIF RInd.IDXGRP = ADS_IGRP_TOOL_INFO_WRITE THEN

(* CNC writes tool life data *)

pTid := RInd.DATAADDR;

BasicToolId := pTid^.basic;

IF BasicToolId <= MAX_TOOLS THEN

(* save actual requested tool T<nr> *)

(* Tool id in valid range *)

RRes.LEN := SIZEOF(pTid^);

RRes.DATAADDR := pTid;

RRes.RESULT := ADS_RDWRT_IND_NO_ERROR;

ELSE

(* no data transmitted in the response *)

RRes.LEN := 0;

RRes.DATAADDR := 0;

RRes.RESULT := WZV_TOOL_ID_BASIC_INVALID;

END_IF

ELSE