Write Data Structure; Writing Data Structure; Digital Tag - Toshiba TOSDIC-CIE DS Instruction Manual

2. Write data structure

2.1. Writing data structure

2.1.1 Digital Tag

FI/FO for PB2p/PB4p/PB8p is 1 word-data (16 bits).
The high-order eight bits are FO1 to FO8 and the low-order eight bits are FI1 to FI8.
And RFO for PB2p/PB4p/PB8p is 1 word-data (16 bits).
When you push a push button, 1 word-data that includes the changed items and
operation status is put into the Holding Registers which is specified in the RFO register
address.
In FO/FI/RFO, the data bits indicate the status.
FO/FI
RFO
PB2 p : BIT1 ∼ BIT2=FI1 ∼ FI2, FO1 ∼ FO2, RFO1 ∼ RFO2
PB4 p : BIT1 ∼ BIT4=FI1 ∼ FI4, FO1 ∼ FO4, RFO1 ∼ RFO4
PB8 p : BIT1 ∼ BIT8=FI1 ∼ FI8, FO1 ∼ FO8, RFO1 ∼ RFO8
The application in the MODBUS/TCP Server performs the operations (latch,
momentary, etc.) for the Push Button Instruction (RFO).
FO(Higher Order Byte)
Items to be Changed
(Higher Order Byte)
Figure 2.1
FI(Lower Order Byte)
Operation Status
(Lower Order Byte)
BIT8 BIT7 BIT6 BIT5
Data Bits of FO/FI/RFO
1.Outline
BIT4 BIT3 BIT2 BIT1
5