Logix5000 Controllers General Instructions - SLAC Confluence

Input/Output Instructions (MSG, GSV, SSV, IOT) 141MnemonicData DescriptionType.FLAGS INT The FLAGS member provides access to the status members (bits) in one 16-bit word.This bit: Is this member:2 .EW4 .ER5 .DN6 .ST7 .EN8 .TO9 .EN_CCImportant: Do not change the EW, ER, DN, or ST bits of the FLAGS member. For example, do notclear the entire FLAGS word. The controller ignores the change and uses the internally-stored valuesof the bits..ERR INT If the .ER bit is set, the error code word identifies error codes for the MSG instruction..EXERR INT The extended error code word specifies additional error code information for some error codes..REQ_LEN INT The requested length specifies how many words the message instruction will attempt to transfer..DN_LEN INT The done length identifies how many words actually transferred..EW BOOL The enable waiting bit is set when the controller detects that a message request has entered thequeue. The controller resets the.EW bit when the .ST bit is set.Important: Do not change the EW bit. The controller ignores the change and uses theinternally-stored value of the bit..ER BOOL The error bit is set when the controller detects that a transfer failed. The .ER bit is reset the nexttime the rung-condition-in goes from false to true.Important: Do not change the ER bit..DN BOOL The done bit is set when the last packet of the message is successfully transferred. The .DN bit isreset the next time the rung-condition-in goes from false to true.Important: Do not change the DN bit..ST BOOL The start bit is set when the controller begins executing the MSG instruction. The .ST bit is resetwhen the .DN bit or the .ER bit is set.Important: Do not change the ST bit. The controller ignores the change and uses theinternally-stored value of the bit..EN BOOL The enable bit is set when the rung-condition-in goes true and remains set until either the .DN bit orthe .ER bit is set and the rung-condition-in is false. If the rung-condition-in goes false, but the .DNbit and the .ER bit are cleared, the .EN bit remains set.Important: Do not change the EN bit..TO BOOL If you manually set the .TO bit, the controller stops processing the message and sets the .ER bit..EN_CC BOOL The enable cache bit determines how to manage the MSG connection. Refer to "Choose a cacheoption" on page 5-170 Connections for MSG instructions going out the serial port are not cached,even if the .EN_CC bit is set..ERR_SRC SINT Used by RSLogix 5000 software to show the error path on the Message Configuration dialog box.DestinationLink INT To change the Destination Link of a DH+ or CIP with Source ID message, set this member to therequired value.Publication 1756-RM003I-EN-P - January 2007