YASKAWA VIPA SPEED7 - FB 72 - RTU_MB_MASTER

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The server responds with 60 byte starting from MB220. DR is set for one CPU

cycle and thus M101.2 is set to "1".

8. The client sends a Modbus request with Function code 05h start address 5008 and

the value FF00h.

The server acknowledges the request and writes "1" to the output Q1.0. NDR is

set for one CPU cycle and thus M101.1 is set to "1".

9. The client sends a Modbus request with Function code 03h start address 50 (does

not exist) and quantity 1.

The server responds with Exception code 02h an sets ERROR/STATUS for one

CPU cycle. MW108 returns 8383h.

9.2 RTU

9.2.1 FB 72 - RTU_MB_MASTER - Modbus RTU master

9.2.1.1 Description

This function block allows the operation of the internal serial RS485 interface of a

SPEED7 CPU from VIPA or a System SLIO CP 040 as Modbus RTU master.

Call parameter

Name Declaration Type Description

REQ IN BOOL Start job with edge 0-1.

HARDWARE IN BYTE 1 = System SLIO CP 040 /

2 = VIPA SPEED7 CPU

LADDR IN INT Logical address of the System SLIO CP 040 (parameter is ignored

with the VIPA SPEED7 CPU).

MB_UNIT_ID IN BYTE Modbus: Device identification = Address of the slave (0 ... 247).

MB_FUNCTION IN BYTE Modbus: Function code.

MB_DATA_ADDR IN WORD Modbus: Start address or Sub function code.

MB_DATA_LEN IN INT Modbus: Number of register/bits.

MB_DATA_PTR IN ANY Modbus: Data buffer (only flag area or data block of data type byte

allowed) for access with function code 03h, 06h and 10h.

DONE* OUT BOOL Job finished without error.

BUSY OUT BOOL Job is running.

ERROR* OUT BOOL Job is ready with error - parameter STATUS has error information.

STATUS* OUT WORD Extended status and error information.

*) Parameter is available until the next call of the FB

Parameter in instance DB

Name Declaration Type Description

INIT STAT BOOL With an edge 0-1 an synchronous reset is established at the System

SLIO CP 040. After a successful reset the bit automatically reset.

VIPA SPEED7

Modbus Communication

RTU > FB 72 - RTU_MB_MASTER - Modbus RTU master

HB00 | OPL_SP7 | Operation list | en | 18-30 190

YASKAWA VIPA SPEED7 - FB 72 - RTU_MB_MASTER - Modbus RTU Master