YOKOGAWA UD310 User Manual Download Page 4

IM 05F01F12-01E 3rd Edition  Mar. 14, 2016-00

4

 Parameter Lists

(1) Operating Parameters : Parameters changed rather frequently during operation.

Code

Name

Setting range and unit

Default

User setting

A1

Alarm 1

setpoint

■  PV alarm    Unit: °C/°F

 

Setting range: [minimum value - (maximum value 

- minimum value)] to maximum value of measured 

input range (scale)

■ 

 Deviation alarm    Unit: °C/°F 

Setting range: –100 to 100% of the measured input 

range (scale) span

Depends on 

the alarm 1 

type.

A2

Alarm 2

setpoint

Depends on 

the alarm 2 

type.

FL

PV input filter

OFF, 1 to 120 seconds
This function should be used when the PV display 

value may fluctuate greatly, for example, when the 

measured input signal contains noise. The filter is of 

the first-order lag type, and FL sets the time constant. 

If a larger time constant is set, the filter can remove 

more noise.

Input

2-seconds filter

10-seconds filter

OFF

BS

PV input bias

–100 to 100% of measured input range (scale) span
This function adds a bias value to the measured 

input value, and the result is used for display and 

retransmission output.

PV value inside the manual setter

 = 

measured input value

 + 

PV input bias

This function is useful for carrying out fine adjustment 

when the PV value is within the required accuracy but 

it differs from the value obtained by other equipment.

0% of 

measured input 

range (scale) 

span

LOC

Key lock

0: No key lock

1:  Prevents parameter from being changed of except 

for SP in the operating display.

2:  Prevents all parameter changing operations 

including SP in the operating display.

–1:  Set ″-1″ to enter the setup parameter setting 

display. 

But if  ″LOC=1 or 2″ is already set, the parameter 

value can not be changed by setting ″LOC=-1″ 

only. To change the parameter value, set ″LOC=0″ 

at first (for disabling keylock), then set ″LOC=-1″ 

once again.

0

(2) Setup Parameters : Parameters rarely changed in normal use after once having been set.

Code

Name

Setting range and unit

Default

User setting

IN

Measured input 

type

1 to 23, 31 to 48 (See input range code list.)

OFF: No input

(If no input type is specified at the time of ordering, 

you must set the input type.)

OFF, or the 

input range 

code specified 

with order

DP

Decimal point 

position of 

measured input

0: No decimal place (nnnn)

1: One decimal place (nnn.n)

2: Two decimal places (nn.nn)

3: Three decimal places (n.nnn)

(Displayed at voltage input)

1

RH

Maximum 

value of 

measured input 

scale

(RL + 1) to 9999

(Displayed at voltage input)

100.0

RL

Minimum value 

of measured 

input scale

–1999 to (RH –1)

(Displayed at voltage input)

0.0

SPH

Maximum 

value of target 

setpoint range

(Setpoint for 

manual setting 

output 20mA)

SPH setting range:

(SPL+1digit) to the maximum value of the measured 

input range (scale) ; Unit: °C/°F

SPL setting range:

Minimum value of the measured input range (scale) to 

(SPH –1digit) ; Unit: °C/°F

Measured input range

Target setpoint range

(Factory-set default)

Target setpoint range

(after scaling)

SPL

SPL

Minimum value 

of measured input 

range (scale)

Maximum value 

of measured input 

range (scale)

SPH

4mA

20mA

SPH

Manual setting output

(4 to 20mA)

Maximum 

value of 

measured input 

range (scale)

SPL

Minimum 

value of target 

setpoint range

(Setpoint for 

manual setting 

output 4mA)

Minimum value 

of measured 

input range 

(scale)

RTH

Maximum 

value of 

retransmission 

output

Temperature input : Within measured input range 

Voltage input : (RTL+1digit) to max. value of 

measured input scale(RH)

Min. value of measured input scale(RL) to (RTH-

1digit)

However, RTL<RTH

Maximum 

value of 

measured input 

range (scale)

RTL

Minimum 

value of 

retransmission 

output

Minimum value 

of measured 

input range 

(scale)

AL1

Alarm 1 type

OFF or a value from 1 to 22 (see the table of alarm 

function list), and either

OFF

AL2

Alarm 2 type

OFF

HY1

Alarm 1 

hysteresis

0.0 to 100.0% of measured input range (scale) span

Unit: °C/°F

0.5% of 

measured input 

range (scale) 

span

HY2

Alarm 2 

hysteresis

0.5% of 

measured input 

range (scale) 

span

PVD

PV/SP display

ON:  Displays PV (measured input) and SP (target 

setpoint)

OFF: Displays SP (target setpoint)

No display

Target setpoint(SP)

Measured input(PV)

Factory-shipped setting

(PVD=ON)

(PVD=OFF)
Even if a measured input 

(PV) is not displayed, 

the PV retransmission 

ouptut and the alarm 

action work normally.

Target setpoint(SP)

ON

Parameters to be set for temperature input.
1. Measured input type (IN) : Set according to a sensor.

Note : Display scale can not be changed.

Parameters to be set for voltage input.
1. Measured input type (IN) : Set according to an input signal.
2. Decimal point position of measured input (DP) : 
 

Set the position of the decimal point for measured input display.

3. Maximum value of measured input scale (RH) : 
 

Set the maximum value of the scale. 

 

(Set the display value at maximum value of input signal.)

4. Minimum value of measured input scale (RL) :
 

Set the minimum value of the scale.

 

(Set the display value at miminum value of input signal.)

Example of Voltage Input

Example of Temperature Input

Measured Input Range

-270

°C

1370

°C

-270

°C

1370

°C

Display Scale

Minimum value 

of measured input

scale (RL)

1V

5V

0.0

°C

200.0

°C

Maximum value

of measured input

scale (RH)

RL

RH

Measured Input Range

Measured Input Scale

(input signal)

Minimum value

of measured

input range

Maximum value

of measured

input range

Description of Measured Input

 Alarm Function List

Alarm 

type

Action

“Opn” and “Cls” indicate that 

the relay contact is opened 

and closed; “(on)” and “(off)” 

indicate that the lamp is on and 

off; and white triangles indicate 

temperature setpoints.

Alarm 

type code

Alarm 

type

Action

“Opn” and “Cls” indicate that 

the relay contact is opened 

and closed; “(on)” and “(off)” 

indicate that the lamp is on and 

off; and white triangles indicate 

temperature setpoints.

Alarm 

type code

Closed 

contact

during 

alarm

Open 

contact

during 

alarm

Closed 

contact

during 

alarm

Open 

contact

during 

alarm

No alarm

OFF

De-energized 

on deviation 

low limit

Hysteresis

Temperature setpoint

Deviation setting

Measured value

Opn (on)

Cls (off)

6

16

(See note.)

PV

high limit

Hysteresis

Alarm setting

Measured value

Opn (off)

Cls (on)

1

11

(See note.)

PV

low limit

Hysteresis

Alarm setting

Measured value

Opn (off)

Cls (on)

2

12

(See note.)

Deviation 

high and 

low limit

Hysteresis

Hysteresis

Temperature setpoint

Deviation setting

Measured value

Cls 

(on)

Opn

(off)

Cls

(on)

7

17

(See note.)

Deviation 

high limit

Opn (off)

Hysteresis

Cls (on)

Measured value

Temperature setpoint

Deviation setting

3

13

(See note.)

Deviation 

within 

high- and 

-low-limit

Hysteresis

Hysteresis

Temperature setpoint

Measured value

Opn (off)

Opn (off)

Cls (on)

Deviation setting

8

18

(See note.)

Deviation 

low limit

Cls (on)

Hysteresis

Opn (off)

Measured value

Temperature setpoint

Deviation setting

4

14

(See note.)

De-energized 

on PV

high limit

Hysteresis

Opn (on)

Cls

(off)

Alarm setting

Measured value

9

19

(See note.)

De-energized 

on deviation 

high limit

Measured value

Temperature setpoint

Hysteresis

Deviation setting

Opn (on)

Cls (off)

5

15

(See note.)

De-energized 

on PV

low limit

Hysteresis

Cls (off)

Opn (on)

Alarm setting

Measured value

10

20

(See note.)

Fault 

diagnosis 

alarm

The contact is closed at input 

burnout.

21

FAIL

output

The output contact is opened 

in the following events:

• Program error • 

A/D converter error

• ROM error 

• RJC error

• RAM error 

• EEPROM error

• power failure

22

Note:  The alarms numbered 1 to 10 have 

no waiting action, while alarms 11 

to 20 have a waiting action. 

The waiting action turns off the 

PV and deviation alarms that 

occur from the start of the control 

operation until a stable state is 

reached.

Abnormal

Alarm output = ON

Normal

Low limit alarm 

setpoint

In this area, the alarm output is turned 

off even when a measured value falls 

below the low limit alarm setpoint.

Time

Power-on

°C

Taken as 

normal.

Waiting action

Description of Alarm Functions

Description of Alarm hysteresis

The alarms are output as relay outputs. Since a relay has a limited service life, excessive on/off 

actions will shorten the life of the relay. To prevent this, you can set a hysteresis for both alarm 1 

and alarm 2 to moderate excessive on/off actions.

Relay contact is closed (ON)

Relay contact 

is opened

Temperature

Temperature

time

Alarm 1 setpoint  : 100°C

Relay contact is closed (ON)

Relay contact 

is opened

time

Alarm 1 setpoint : 100°C

HY1 : 15°C

HY1 : 5°C

Measured input 

value (PV)

Measured input

valued (PV)

Alarm ON

OFF

ON
OFF

ON

OFF

Alarm ON

OFF

< PV High Limit Alarm >

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