Panasonic FP-M 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 FP series programmable controller, 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 FP series programmable controller 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
FP-M.
You can use it only for monitoring the program capacity of the FP-M.
2
System registers 5, 6, 7, 8, and 14: Characteristics settings of the area for timer/counter
instructions and 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 a low battery 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.