6-2. How to Read Special Internal Relays(R) & Special Data Registers(DT)
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6-2.How to Read Special Internal Relays(R) &
Special Data Registers(DT)
Internal relays(R) and data registers(DT) whose usage has been already determined by the system design are called
“special internal relays(R)” and “special data registers(DT)”.
Since they are specialized for indicating the setting conditions or operating status of a network, it is very effective
to use them for network operation checking and operation control.
In this section, the special internal relays(R) and the special data registers(DT) used for the W Type(Wire) Link
System are described.
1. Monitoring Special Internal Relays(R) & Special Data Registers(DT)
The operating condition can be checked by monitoring the special internal relays(R) and special data registers(DT).
Monitoring is performed using a programming tool which is explained as follows:
Using the FP Programmer
The tools to be prepared : FP Programmer II
: AFP1114, (or FP Programmer : AFP1112A or AFP1112)
FP Peripheral Cable : AFP5520(0.5m) or AFP5523(3m)
1) Connect the FP Programmer to the RS422 port on the CPU using the FP Peripheral Cable.
Note :
2) Select the special internal relays(in unit of words) or special data registers to be monitored.
3) Select a word of special internal relays(WR) or a special data register(DT).
[word special internal relay]
The data from the specified address will be displayed in
decimal.
[special data register]
Select a number system from the three possibilities(Decimal, Hexadecimal, Binary)
[Decimal]
When the address is selected using the procedure above, the data will be displayed in decimal.
To change the number system to decimal from hexadecimal or binary, press the
key.
Note :
• When the data is displayed in decimal, the letter “K” will be displayed on the display of the
FP Programmer
II
.
(BIN)
K/H
Address
NOT
DT/Ld
READ
OR
R•WR
Word
address
READ
ACLR
(–)
OP
8
ENT
• If the AFP1112 type FP Programmer is used, the baud rate must be set at the CPU because to
set the baud rate of the CPU for 19,200 .
