Static variables in ModbusMaster - Manual - SIMATIC AX - Instructions that can be used for Modbus-RTU communication. - Siemens.Simatic.S71500.CommunicationsProcessor.ModbusRtu,library

This table below shows the public static variables in the instance of ModbusMaster that you can use in your program.

Variable	Data type	Default	Description
Blocked_Proc_Timeout	REAL	REAL#3.0	Duration (in seconds) for which to wait for a blocked Modbus master instance before this instance is removed as ACTIVE. This may happen, for example, if a master request was output and the program then stops to call the master function before it has completely finished the request. The time value must be greater than 0 and less than 55 seconds to avoid an error to occur.
Extended_Addressing	BOOL	FALSE	Configures the slave station address as single or double byte. FALSE = One-byte address; 0 to 247 TRUE = Two-byte address (corresponds to extended addressing); 0 to 65535
MB_DB	P2P_MB_BASE	-	The MB_DB parameter of the Modbus_Comm_Load instruction must be connected to this MB_DB parameter of the Modbus_Master instruction.