Product outline

F701 is a general-purpose weighing controller that is compatible with all weighing systems. This is a practical device excellent in cost effectiveness, which is equipped with the final discharge function allowing high-accuracy feeding and discharging weighing control, the weighing sequence function essential to hopper and packing scales, and the interface connectable to various peripherals such as RS-232C and BCD output.


Analog section
Excitation voltage 10V DC ±5%, Output current; within 120mA, remote sense type
(Up to 4 loadcells at 350Ω are parallel-connectable.)
Zero adjustment range 0 to 1.5mV/V for HI gain
0 to 3.0mV/V for LO gain (digital adjustment)
Input of approx. 0.5mV/V or 1.0mV/V,
Selectable adjust to zero [by dip switch on the rear panel]
Gain adjustment range

2 stages of gain selectable according to the output of loadcell [by dip switch on the rear panel]
0.5 to 1.5mV/V for HI gain
1.0 to 3.0mV/V for LO gain (digital adjustment)

Min. input sensitivity 0.5μV/count
Accuracy Non-linearity: within 0.01%/FS
Zero drift: within 0.2μV/°C RTI (Typ: 0.15μV/°C)
Gain drift: within 15ppm/°C (Typ: 7ppm/°C)
Noise: within 0.1μVp-p RTI (0.1 to 10 Hz)
Analog filter Bessel low-pass filter (-12dB/oct.)
Selectable from 2, 4, 6, 8 Hz
A/D converter Speed: 100 times/sec.
Resolution: 16 bit
Min. display resolution 1/10000
Secondary calibration Calibration can be carried out without an actual load by connecting a resistor to one of the bridges of a loadcell.
Setting section
Setting method ・ Keyboard operation (membrane switch with a key click buzzer)
・ External setting is available by installing a setting point option or RS-232C option
Setting value storage ・ Initial set values: NOV RAM (Non-volatile RAM)
・ Other set values: C-MOS RAM with backup of a lithium battery
(Effective for more than 7 years depending on usage conditions and storage environment.)
Setting value protection Setting operation can be locked to prevent unauthorized modifications of default values and calibration by malfunction
Setting items

・ Upper Limit/ Lower Limit/ Near Zero/ Set Point 1/ Set Point 2/ CPS/ Over/ Under/ Final
・ Comparison Inhibit Time/ Judging Time/ Complete Output Time/ Compensation Feeding Time/ Auto Zero Count/ Judging Count/ Auto Free Fall Compensation Regulation/ Preset Tare Weight
・ Weighing Function 1/ Weighing Function 2/ Weighing Function 3/ Sequence Mode/ Function Key Disablement/ Filter/ Motion Detection/ Zero Tracking/ Setting Value Lock
・ Balance Weight/ Capacity/ Min. Scale Division/ Over Net/ Over Gross/ DZ Regulation Value/ Function Selection/ Gravitational Acceleration/ Optional Board
・ D/A Output Mode/ D/A Zero Output Weight Value/ D/A Full Scale/ RS-232C I/F・RS-485 I/F/ ID Number/ Set Point Interface/ External Function Selection/ Standard/NTEP Mode Selection
・ Span Calibration/ Zero Calibration

I/O section
External output signal Transistor’s open collector output (Emitter = COM terminal); Output is LO when transistor is ON (Near zero, SP1, SP2, SP3, go or comp, over, under, high limit, Low limit, stable, weight alarm or error, run)
External input signal ON when shorted to COM terminal by TTL-level relay, switch, transistor, or open collector output. (Feed / discharge, tare ON, tare OFF, zero, gross / net, hold or judgment, start, stop) (Drive current: 10mA or less)
Output Conditions – SP1: Net weight >= final weight-SP1
– SP2: Net weight >= final weight-before final
– SP3: Net weight >= final weight-FF
– Under: Net weight < final weight-underweight
– Over: Net weight > final weight-overweight
– Go: Final weight+overweight >= netweight >= final weight-underweight
Interface ・ SIF: 2-wire type serial interface (standard); Interface to link with Unipulse printer or external display.
・ SPI: Interface for set-point units (Optional); Interface to enter various set values via digital switches.
・ BCO: BCD parallel data output interface (Optional): Parallel interface to transmit weight data to a printer, external display, PC or sequencer.
・ 232: RS-232C communication interface (Optional): Write (change)/read weight data, various statuses and setting values from a PC or sequencer.
・ 485: RS-485 communication interface (Optional): Allows longer-distance communication than RS-232C. ID numbers are set, and multiple units of F701 are parallel-connectable.
・ DAC: D/A converter interface (Optional); Interface to convert weight data to current signal and output it.
Display section
Display unit Numerical display (7 digits) with a character height of 18.5mm by fluorescent display tube
Display value 5 digits, Minus sign displayed on most significant digit
Scale capacity 5-digit numerical values
Min. scale division 1 to 100
Decimal point Selectable from 0, 0.0, 0.00, 0.000 (with zero blanking function)
Over-scale display Input of A/D converter overflow,
Net weight over the set net value,
Scale capacity + 9 scale divisions,
Gross weight over the set gross weight
Center zero True zero point or the center of each value is displayed.
Unit display Selectable from t, kg, g, N, lb, none
General performance
Power supply voltage 85 to 110V, 102 to 132V, 170 to 220V, 187 to 242V AC
(Please specify when ordering), 50/60 Hz
Power consumption 15VA
Operating conditions Temperature: Working temperature range -10°C to +40°C;
Storage temperature range -20 to +85°C
Humidity: 85% RH or less (non-condensing)
Dimensions 192(W)×96(H)×160(D) mm (protruding parts not included)
Panel cutout dimensions 186 +2 -0(W)×92 +1 -0(H)mm
*Installation panel thickness: 1.6mm or more
Weight Approx. 2.2 kg
AC input cord (2m) 1
Spare fuse (1A) 1
Loadcell input connector 1
Control signal I/O connector 1
Flathead screwdriver 1
Operation Manual 1
Set point unit connector (when set point unit option is installed) 1
BCD output connector (when BCD output option is installed) 1
D/A converter connector (when D/A converter option is installed) 1


SPI Set point unit interface
BCO BCD parallel data output interface
232 RS-232C communication interface
485 RS-485 communication interface
DAC D/A converter interface

Optional accessories

E780 Set point unit
LB01-NH Lithium battery (with NH connector)
CAAC2P-P2 AC input cord 2m
CAAC3P-CEE7/7-P1.5 AC input cord (250V withstand voltage) 1.5m
CN3P-2P 3P-2P conversion plug for AC input cord
CA4131 (6-core) cable with JR connector at one end (cable end is separated) 3m
CA4230 JR-PRC conversion relay (6-core) cable 0.3m
CA4311 JR-PRC conversion relay (6-core) 4-wire type/6-wire type (for 520A) 1m
CA7 Coaxial cable with BCN on both ends 1.5m
CA8 BNC-alligator clip cable 1.5m
CA3150 Flexible flat cable with 57F 36 pins at both ends
CN21 57 series 36p connector for BCD output/set point unit
CN23 57 series 24p connector for external input/output
CN35 D-sub 25p connector for RS-232C

Please note that there are possibilities of individual differences in a color tone on display devices such as LEDs, fluorescent display tubes and LCDs due to manufacturing process or production lots.


Product catalogue(PDF)
⇒Download Page
Operation manual(PDF)
External dimension
Support tools