NAiS FP1, Hardware Manual

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8-5. System Registers
8-5. System Registers
1. What are System Registers
• The FP series programmable controller is configured by setting certain parameters. The parameters, which
configure the system and special functions, are called system registers.
• Like other registers in the FP1, each system register consists of 16 bits. System register addresses are also assigned
to each of the system registers.
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Summarizing the Functions of System Registers
By function, system registers of the FP1 are classified into 8 types, as follows:
1
System register 0: Size prepared for program capacity (fixed).
The value in this system register cannot be changed when you use an
FP1.
You can use it only for monitoring the program capacity of the FP1.
2
System registers 5, 6, 7, 8, and 14: Characteristics settings of operands.
Performs assignments for numbers of timers/counters and the
hold/non-hold area.
3
System registers 4, 20, and 26: Operation settings when abnormality is detected.
Sets whether the duplicated use of output and battery errors are to be
regarded as errors, or whether the programmable controller should
execute a program when an operation error occurs.
4
System registers 31 and 34: Processing time settings.
Sets the scan time of the programmable controller and the waiting time
of computer link communication.
5
System registers 400, 402, and 403: Input mode settings.
Performs settings of the inputs, such as high-speed counter input, pulse
catch inputs, and interrupt inputs.
6
System registers 404 through 407: Input time filtering settings.
Sets the input time constants in 8-input units.
7
System registers 410 and 411: Communication settings of port for programming tools (RS422).
Sets the station number, the character length, and the modem
compatibility for the programming port.
8
System registers 412 through 418: Communication settings of RS232C serial port.
Sets the communication specifications of the RS232C serial port, such
as communication mode, data format, and modem compatibility.