FB_MDP_ReadModuleHeader 1:

The function block enables querying of the header of an IPC diagnostics module.


    bExecute     : BOOL;
    nDynModuleId : BYTE;             (* the dynamic module id for which the module header is requested *)
    tTimeout     : TIME := DEFAULT_ADS_TIMEOUT; (* States the time before the function is cancelled. *)
    sAmsNetId    : T_AmsNetId;       (* keep empty '' for the local device *)

bExecute: The function block is called by a rising edge on the input bExecute, if the block is not already active.

stMDP_DynAddr: The MDP addressing belonging to the selected network module is specified at this input. The dynamic Module ID must already be specified with it.

tTimeout: Specifies a maximum length of time for the execution of the function block.

sAmsNetId: To execute the query on the local device, it is not necessary to specify this input variable. Alternatively, an empty string can be specified. To direct the query to another computer, its AMS Net Id (of type T_AmsNetId) can be specified here.


    bBusy           : BOOL;
    bError          : BOOL;   (* indicates if Read was successfull or not *)
    nErrID          : UDINT;
    stMDP_ModHeader : ST_MDP_ModuleHeader;

bBusy: This output is TRUE as long as the function block is active.

bError: Becomes TRUE as soon as an error situation occurs.

nErrID: Returns an error code if the bError output is set.

stMDP_ModuleHeader: At this output the header information for the read IPC diagnostics modules is displayed in the form of the structure ST_MDP_ModuleHeader.


Development environment

Target platform

PLC libraries to include

TwinCAT v3.1.0

PC or CX (x86, x64, ARM)