5.2 Settings Related to Communication
Function
Set the following parameters when the communication function is
specified for the output 2.
For more information on communication functions, see the user’s
manual for VJ Series Communication Functions (IM 77J01J11-
01E).
5.2.1 Communication Protocol
Select the communication protocol from among PCLINK,
PCLINK WITH SUM, MODBUS ASCII, MODBUS RTU and
LADDER in
[F01: PROTOCOL]
.
5.2.2 Communication Address
Set the address number of the converter numerically in a
range of 1 to 99 in
[F02: ADDRESS]
.
5.2.3 Baud Rate
Set the baud rate by selecting from among 1200, 2400, 4800,
9600, 19200, and 38400 bps in
[F03: BAUD RATE]
.
5.2.4 Parity
Select the parity from among NONE, EVEN and ODD in
[F04:
PARITY]
.
5.2.5 Data Length
Select the data length from among 7 bits and 8 bits in
[F05:
DATA LEN]
.
5.2.6 Stop Bit
Select the stop bit from among 1 bit and 2 bits in
[F06: STOP
BIT]
.
5.2.7 Decimal Point Position
Number of decimals of input value (setting of D register
[D0003]) can be set. Select the number of decimals from
among 0 to 5 in
[F07: INPUT DEC PT]
.
5.3 Settings Related to Alarm Output
Set the following parameters when the alarm output is specified
for the output 2.
5.3.1 Alarm Setpoint
Set the alarm-1 setpoint and alarm-2 setpoint numerically
in
[E01: SET POINT1]
and
[E02: SET POINT2]
for
thermocouple input and RTD input or in
[E03: SET POINT1]
and
[E04: SET POINT2]
for mV input. Set them in [°C/K] for
temperature input or in [%] for mV input.
•
Setting range: 0 to 100% of input range
•
Setting resolution: 0.1% (for mV input), 4 significant digits
(for temperature input)
5.3.2 Direction of Alarm Action
Select the direction of alarm-1 action and that of alarm-2
action from among HIGH ALM (high-limit alarm) and LOW
ALM (low-limit alarm) in
[E05: ALM1 ACTION]
and
[E06:
ALM2 ACTION]
.
•
To activate alarm status when input signal ≥ alarm setpoint,
select HIGH ALM.
•
To activate alarm status when input signal ≤ alarm setpoint,
select LOW ALM.
5.3.3 Hysteresis
Set the alarm-1 hysteresis and alarm-2 hysteresis numerically
in
[E07: HYSTERESIS1]
and
[E08: HYSTERESIS2]
for
thermocouple input and RTD input or in
[E09: HYSTERESIS1]
and
[E10: HYSTERESIS2]
for mV input.
Hysteresis is a value added to the alarm setpoint in order for
an alarm status to be released (to normal) after the alarm
status has been activated. The alarm status will be released in
the following conditions, depending on the direction of alarm
action.
* When HIGH ALM (high-limit alarm) is set: Alarm is released
when input signal < (alarm setpoint - hysteresis).
* When LOW ALM (low-limit alarm) is set: Alarm is released
when input signal > (alarm se hysteresis).
Set them in [°C/K] for temperature input or in [%] for mV input.
•
Setting range: 0 to 100% of input range
•
Setting resolution: 0.1% (for mV input), 4 significant digits
(for temperature input)
5.3.4 Alarm ON Delay and Alarm OFF Delay
Set the alarm-1 ON delay and alarm-2 ON delay numerically in
[E11: ON DELAY1]
and
[E12: ON DELAY2]
. Set the alarm-1
OFF delay and alarm-2 OFF delay numerically in
[E13: OFF
DELAY1]
and
[E14: OFF DELAY2]
.
An alarm ON delay is a delay time from the establishment of
alarm conditions to its output; an alarm OFF delay is a delay
time from the establishment of return-to-normal conditions to
its output.
•
Setting range: 0 to 999 seconds
• Setting resolution:
1 second (However, about 0.2 second is
to be added to the set time to prevent wrong operation.)
For example, when an alarm ON delay is set to 1 second,
alarm output is generated if alarm status continues for 1
second or more after the input value exceeds the alarm
setpoint. Furthermore, when an alarm OFF delay is set
to 2 seconds, alarm output is released if normal condition
continues for 2 seconds or more after the input value has
returned to normal from the alarm status.
5.3.5 Direction of Relay Action
Select the direction of relay energizing in alarm-1 normal
condition and alarm-2 normal condition from among NRM DE-
ENERGIZED (de-energized under normal condition) and NRM
ENERGIZED (energized under normal condition) in
[E15: RL1
ACTION]
and
[E16: RL2 ACTION]
.
6. DESCRIPTION OF ALARM ACTIONS
This chapter describes examples of alarm actions under the
following conditions.
Item
Alarm 1
Alarm 2
Parameter
Setpoint
Parameter
Setpoint
Direction of alarm
action
E05: ALM1 ACTION High-limit
alarm
E06: ALM2 ACTION
Low-limit
alarm
Alarm setting
E03: SET POINT1
80%
E04 : SET POINT2
15%
Hysteresis
E09: HYSTERESIS1 10%
E10 : HYSTERESIS2 5%
Alarm ON delay
E11: ON DELAY1
1 sec
E12 : ON DELAY2
3 sec
Alarm OFF delay
E13: OFF DELAY1
2 sec
E14 : OFF DELAY2
4 sec
Description of
alarm actions
The alarm is output if the
condition where the input value
is 80% or more of high-limit
alarm continues for 1 second
or more.
After the alarm is output, when
the condition where the input
value is less than 70% of
high-limit alarm continues for
2 seconds or more, the status
returns to normal.
The alarm is output if the
condition where the input value
is 15% or less of low-limit
alarm continues for 3 seconds
or more.
After the alarm is output, when
the condition where the input
value is more than 20% of
low-limit alarm continues for
4 seconds or more, the status
returns to normal.
Figure 6.1
Alarm-1 action
Alarm-2 action
Normal
Normal
Normal
Normal
Alarm
Alarm
[
％
]
0
20
15
40
60
80
100
1 s.
2 s.
3 s.
4 s.
Alarm-2 hysteresis (5%)
Alarm-1 hysteresis (10%)
Alarm-1 setpoint (80%)
Alarm-2 setpoint (15%)
Elapsed time s.
[1]
[2]
[3]
[4]
Alarm-1
ON delay
Alarm-2
ON delay
Alarm-2
OFF delay
Alarm-1
OFF delay
Alarm conditions established
Alarm conditions
established
Normal conditions
established
Normal conditions established
High-limit alarm ON
Low-limit alarm ON
High-limit alarm OFF
Low-limit alarm OFF
[1] Alarm status does not continue for more than 1 second after the
alarm conditions are established at alarm 1.
[2] Normal status does not continue for more than 2 seconds after
the normal conditions are established at alarm 1.
[3] Alarm status does not continue for more than 3 seconds after the
alarm conditions are established at alarm 2.
[4] Normal status does not continue for more than 4 seconds after
the normal conditions are established at alarm 2.
7. LIST OF PARAMETERS
Parameter Display Item
MODEL
Model
TAG NO
Tag no.
SELF CHK
Self-check result
A
DISPLAY1
Display 1
*2
A01
INPUT1
Input value 1
A09
OUTPUT1
Output value 1
A10
OUTPUT2
Output value 2
A15
ALM1 STATUS
Alarm-1 status
A16
ALM2 STATUS
Alarm-2 status
A54
STATUS
Status
*1
A56
REV NO
Rev. no.
A58
MENU REV
MENU REV
A60
SELF CHK
Self-check result
4
IM 77J01U07-01E 10th Edition