F159_MTRN (n_Number=16#8000)

Toggle communication mode

The communication mode of the CPU's communication ports can be changed during RUN mode. You can toggle between program controlled mode and MEWTOCOL-COM mode by executing F159_MTRN and setting the variable n_Number (the number of bytes to be sent) to 16#8000.

Parameters

Input

s_Start (WORD, INT, UINT)

Send buffer

n_Number (WORD, INT, UINT)

Number of bytes to send:

Negative value: The end code selected in the system registers is not appended to the send string.
0 (zero bytes): Prepare system to receive further data
16#8000: Toggle communication mode

d_Port (WORD, INT, UINT)

Specifies the communication ports depending on the PLC type:

COM port e.g. SYS_COM0_PORT
Ethernet port e.g. SYS_ETHERNET_USER_CONNECTION_1
MCU/SCU e.g. 16#xx01 (xx = slot number) in COM01

Remarks

When the power is turned on, the communication mode selected in the system registers is set.
It is not possible to change to Modbus RTU mode or PLC Link mode during RUN mode.

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR 
		bSwitchToMewtocolSlave: BOOL:=FALSE;
		wDummy: WORD:=0;
		bSwitchToProgramControlled: BOOL:=FALSE;
	END_VAR

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 9 ;
        NETWORK_BODY
B(B_COMMENT,,Changing COM 1 from program controlled to MEWTOCOL-COM Slave mode.ø^The corresponding transmission mode flag R9032 (sys_bIsComPort1ProgramControlled) is setø^when program controlled mode is selected.,1,0,39,3,);
B(B_VARIN,,wDummy,26,5,28,7,);
B(B_VARIN,,16#8000,26,6,28,8,);
B(B_F,F159_MTRN!,,28,3,36,9,,?DEN?Ds_Start?Dn_Number?Dd_Port?AENO);
B(B_VARIN,,SYS_COM1_PORT,26,7,28,9,);
B(B_CONTACT,,bSwitchToMewtocolSlave,6,4,8,6,R);
B(B_CONTACT,,sys_bIsComPort1ProgramControlled,19,4,21,6,);
L(1,5,6,5);
L(8,5,19,5);
L(21,5,28,5);
L(1,0,1,9);
        END_NETWORK_BODY
    END_NET_WORK
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 7 ;
        NETWORK_BODY
B(B_COMMENT,,Changing COM 1 from MEWTOCOL-COM Slave to program controlled mode.,1,0,30,1,);
B(B_VARIN,,wDummy,26,3,28,5,);
B(B_VARIN,,16#8000,26,4,28,6,);
B(B_F,F159_MTRN!,,28,1,36,7,,?DEN?Ds_Start?Dn_Number?Dd_Port?AENO);
B(B_VARIN,,SYS_COM1_PORT,26,5,28,7,);
B(B_CONTACT,,sys_bIsComPort1ProgramControlled,19,2,21,4,N);
B(B_CONTACT,,bSwitchToProgramControlled,6,2,8,4,R);
L(8,3,19,3);
L(21,3,28,3);
L(1,3,6,3);
L(1,0,1,7);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

(* Changing COM 1 from program controlled to MEWTOCOL-COM Slave mode. 
   The corresponding transmission mode flag R9032 (sys_bIsComPort1ProgramControlled) is set
   when program controlled mode is selected. *)
if (DF(bSwitchToMewtocolSlave) AND sys_bIsComPort1ProgramControlled) then
   F159_MTRN(s_Start := wDummy, n_Number := 16#8000, d_Port := SYS_COM1_PORT);
end_if;
(* Changing COM 1 from MEWTOCOL-COM Slave to program controlled *)
if (DF(bSwitchToProgramControlled) AND NOT sys_bIsComPort1ProgramControlled) then
   F159_MTRN(s_Start := wDummy, n_Number := 16#8000, d_Port := SYS_COM1_PORT);
end_if;