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Chapter 7 Communication function
7-96
[Table 7.23] describes I/O specification of dedicated Function Block.
[Table 7.23] I/O specification of dedicated Function Block
Class I/O Type Description
REQ BOOL
Function Block starts service at rising edge (0 to 1).
(If Function Block is in-service, alteration of 0 -> 1 may be ignorable)
SLOT USINT
Selects slot number of self station’s Cnet I/F module to be transmitted to this
Function Block.
CH UDINT
Specifies communication channel in Cnet I/F module to perform this service.
(0 : RS-232C / 1 : RS-422 )
ST_NO UDINT
The other station No. to communicate via this Function Block is input in decimal
(0~31).
VAR STRING
Displays the other station’s memory area to read or write via Function Block with the
string characters input as surrounded by quotation mark. Max.16 characters can be
input for direct variables while BYTE area only is available for the display.
Ex.) ‘%MB100’, ‘%QB20’, ‘%IB50’…..
data_LEN USINT
Unit length of data to read or write is input.
(Max. 110 Bytes)
data_WR
USINT
ARRAY
Specifies start address of local PLC in direct variable byte type where data to write to
the other station is saved (used for GM_WR FB).
Ex.) %MB40, %MB1000
input
data_RD
USINT
ARRAY
Specifies start address of local PLC in direct variable byte type where data to read
from the other station is saved (used for GM_RD FB).
Ex.) %MB40, %MB1000
NDR BOOL
Turned On after the service is finished without error as kept On until the next
Function Block is called.
ERR BOOL
Turned On when error occurs as a result of execution of the Function Block as kept
On until the next Function Block is called. If ERR is set, error code is displayed on
STATUS
output
STATUS USINT
Error code If ERR is 1. If NDR is 1, it is ‘0’
In dedicated Function Block, frame definition is unnecessary in Frame Editor differently from user defined mode and
data of the other station can be read or written via only Function Block above, however, Cnet I/F module operated as
a master station shall be surely of Ver.2.0 or later, though slave Cnet I/F module operated as the other station is of
the former version. The other station No. shall be as specified via Frame Editor, if the station number is different,
slave Cnet I/F module does not respond.