MSG_OUT

MSG_OUT contains the message data to be transferred, for example, ASCII characters for an ASCII transfer, definition of termination characters for terminated ASCII input or Modbus templates for Modbus master messages.

The data type that must be assigned to the parameter has to be a data type WORD array. This array has to be assigned to a 4x register range. The field length must equal the length of the MSG_IN field. If the field is assigned to the range for Unlocated variables, a runtime error message will be generated.

SET

SET contains the configuration of the XMIT function block in form of the XMIT_SET data structure. This parameter may be assigned to an Unlocated variable.The data structure components have the same function as the components of the LL984 XMIT configuration. There is only one difference, the variables are set automatically by the system and the unused variables are not shown in this data structure. This means, a complete configuration requires that all components in this data structure have to be defined.

PORT

PORT specifies the communications interface. The only authorized values are 0 and 1.

NOTE: When using XMIT, L9_XMIT, or XXMIT EF blocks on the two serial ports of the Momentum 171 CBU 78090 CPU, create an EF block instance for each port. Do not dynamically change the port number. Set the port number as an initial value for each instance because the block stores one single port configuration.

START

A 1-signal at START initiates the XMIT operation. The 1-signal must be applied until the operation has finished or until an error has occurred.

ABORT

A 1-signal terminates the current XMIT operation and writes the abort code 121 to the FaultStatus component of the XMIT_CFG data structure at the CFG output.

MSG_IN

MSG_IN contains the incoming message data, for example, terminated ASCII input or responses of a Modbus master command which was previously sent by the XMIT function block.The data type that must be assigned to the parameter has to be a data type WORD array. This array has to be assigned to a 4x register range. The field length must equal the length of the MSG_OUT field. If the field is assigned to the range for Unlocated variables, a runtime error message will be generated.

CFG

CFG contains an XMIT function block copy of the configuration defined on SET which has the form of data structure XMIT_CFG, it includes the automatically set and not used variables.The data structure components have the same function as the components of the LL984 XMIT configuration.This data structure has to be assigned to a 4x register range. If the data structure is assigned to the range for Unlocated variables, a runtime error message will be generated. CFG is used to verify the actually applied configuration.

OP_ACT

A 1-signal indicates that an XMIT operation is in progress.

NO_SUC

A 1-signal indicates that an error has occurred or that the current XMIT operation is terminated.

OP_SUC

A 1-signal indicates that the XMIT operation has been completed successfully.

EXT

Displays an error code (except in hot standby)