NAiS FP1 Hardware Manual Download

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<If you are using MENU 1 screen type>
Open [NPST MENU] by pressing

, and then

select “PLC CONFIGURATION” to skip to the
[PLC CONFIGURATION] subwindow.
In the [PLC CONFIGURATION ] subwindow,
select “1. SYSTEM REGISTER”.

<If you are using MENU 2 screen type>
Open [NPST FUNCTION MENU] by pressing

, and then select “R. SYSTEM

Esc

8-8. FP1 Modem Communication

C24, C40, C56, and C72 series FP1 programmable controllers have modem communication functions.
This allows data transfer and long-distance communication between a personal computer and an FP1.
This function is available not only for the computer link function but also when NPST-GR Software is used.

1. Using the Programming Tool Port (RS422)

When modem communication is performed using the RS422 port of an FP1, not only computer link but also
programming with NPST-GR Software can be performed.
To perform modem communication using the RS422 port, set system registers 410 and 411 as follows:

- System register 410......K1 though K32 (See notes below.)
- System register 411......H8001

Notes:

■

How to Set System Registers 410 and 411

• Using NPST-GR Software version 3.1

Open the [SYSTEM REGISTER]-[SET RS422 PORT] window by pressing

together.

The following is displayed:
410

UNIT NO.

[ 1 ] (1- 32)...............Set K1.

411

RS422 FORMAT DATA LENGTH

[ 8BIT/ 7BIT ]..........Select 8-bit or 7-bit.

RS422 MODEM CONNECTION

[ ENAB / DISA ]......Select ENAB.

After setting, save the status of system registers by pressing

Shift

• The modem communication function is available for C24, C40, C56, and C72 series with CPU Ver. 2.7 or

later. (All C24, C40, C56, and C72 series FP1s with a suffix “B” on the part number have this function.)

• With NPST-GR Software version 3.0 or higher, you cannot set system register 411 to the modem enable

mode.

• The baud rate is fixed at 2,400 bps and the setting in system register 414 is ignored.
• The same station number (UNIT NO.) cannot be assigned to FP1s in the same network.
• Since initialization of the modem is performed only by an FP1 whose UNIT NO. (system register 410) is

set to K1, pay attention to the following when station numbers (UNIT NO.s) are assigned to FP1s:

- when one computer communicates with one FP1, system register 410 should be set to K1.
- when one computer communicates with two or more FP1s, no two FP1s can have the same station

number (UNIT NO.) and one of the FP1s in the network must be assigned as station number 1 (UNIT
NO. 1).

• Modem initialization is performed only when the mode of the programmable controller is set from PROG.

to RUN or when the power turns ON in the RUN mode by an FP1 whose UNIT NO. (system register 410)
is set to K1. Therefore, be sure to apply power to the modem, before the FP1 is turned ON.

• Once the modem is initialized successfully, it will not re-initialize if the mode of the programmable

controller is set to RUN from PROG. again.

• When one computer communicates with two or more programmable controllers, set the modem to the

mode without character echo.

• Be sure to set the computer and C-NET Adapters to the same communication format.

H8001 means

Character bit: 7 bits
Parity check: Odd
Stop bit:

1 bit

246

8-8. FP1 Modem Communication