Omron Safety Input Unit NX-SIH400

Omron Safety Input Unit NX-SIH400

Alarm Types

Each alarm can be independently set to one of the following 19 alarm types. The default is 2: Upper limit. (see note.)

Auxiliary outputs are allocated for alarms. ON delays and OFF delays (0 to 999 s) can also be specified.

Note:In the default settings for models with HB or HS alarms, alarm 1 is set to a heater alarm (HA) and the Alarm Type 1 parameter is not displayed.

To use alarm 1. set the output assignment to alarm 1.

Set

value Alarm type

Alarm output operation

Description of function When alarm value X

is positive

When alarm value X

is negative

0 Alarm function OFF Output OFF No alarm

1 Upper- and lower-limit *1 *2

Set the upward deviation in the set point for the alarm upper

limit (H) and the lower deviation in the set point for the alarm

lower limit (L). The alarm is ON when the PV is outside this

deviation range.

(default) Upper-limit

Set the upward deviation in the set point by setting the alarm

value (X). The alarm is ON when the PV is higher than the

SP by the deviation or more.

3 Lower-limit

Set the downward deviation in the set point by setting the

alarm value (X). The alarm is ON when the PV is lower than

the SP by the deviation or more.

4 Upper- and lower-limit

range *1 *3

Set the upward deviation in the set point for the alarm upper

limit (H) and the lower deviation in the set point for the alarm

lower limit (L). The alarm is ON when the PV is inside this

deviation range.

5 Upper- and lower-limit with

standby sequence *1 *4 A standby sequence is added to the upper- and lower-limit

alarm (1). *6

6 Upper-limit with standby

sequence A standby sequence is added to the upper-limit alarm (2). *6

7 Lower-limit with standby

sequence A standby sequence is added to the lower-limit alarm (3). *6

8 Absolute-value upper

The alarm will turn ON if the process value is larger than the

alarm value (X) regardless of the set point.

9 Absolute-value lower-limit The alarm will turn ON if the process value is smaller than the

alarm value (X) regardless of the set point.

10

Absolute-value upper

limit with standby

sequence

A standby sequence is added to the absolute-value upper

limit alarm (8). *6

11 Absolute-value lower-limit

with standby sequence

A standby sequence is added to the absolute-value lower

limit alarm (9). *6

12 LBA (alarm 1 type only)-*7

13 PV change rate alarm-*8

14 SP absolute-value

upper-limit alarm

This alarm type turns ON the alarm when the set point (SP)

is higher than the alarm value (X).

15 SP absolute-value

lower-limit alarm

This alarm type turns ON the alarm when the set point (SP)

is lower than the alarm value (X).

16 MV absolute-value

upper-limit alarm *9

Standard Control Standard Control

This alarm type turns ON the alarm when the manipulated

variable (MV) is higher than the alarm value (X). Heating/Cooling

Control (Heating MV)

Heating/Cooling

Control (Heating MV)

Always ON

17 MV absolute-value

lower-limit alarm *9

Standard Control Standard Control

This alarm type turns ON the alarm when the manipulated

variable (MV) is lower than the alarm value (X). Heating/Cooling

Control (Cooling MV) Heating/Cooling

Control (Cooling MV)

Always ON

18 RSP absolute-value

upper-limit alarm *10

This alarm type turns ON the alarm when the remote SP

(RSP) is higher than the alarm value (X).

19 RSP absolute-value

lower-limit alarm *10

This alarm type turns ON the alarm when the remote SP

(RSP) is lower than the alarm value (X)

1.With set values 1. 4 and 5. the upper and lower limit values can

be set  independently for each alarm type, and are expressed as

“L” and “H.”

*2.Set value: 1. Upper- and lower-limit alarm

*3.Set value: 4. Upper- and lower-limit range

*4.Set value: 5. Upper- and lower-limit with standby sequence

For Upper- and Lower-Limit Alarm Described Above *2

• Case 1 and 2

Always OFF when the upper-limit and lower-limit hysteresis overlaps.

• Case 3: Always OFF

*5.Set value: 5. Upper- and lower-limit with standby sequence

Always OFF when the upper-limit and lower-limit hysteresis

overlaps.

*6.Refer to the E5@C Digital Temperature Controllers User's Manual

(Cat. No. H174) for information on the operation of the standby

sequence.

*7.Refer to the E5@C Digital Temperature Controllers User's Manual

(Cat. No.H174)  for information on the loop burnout alarm (LBA).

*8.Refer to the E5@C Digital Temperature Controllers User's Manual

(Cat. No. H174) for information on the PV change rate alarm.

*9.When heating/cooling control is performed, the MV absolute

upper limit alarm functions only for the heating operation and the

MV absolute lower limit alarm functions only for the cooling

operation.

*10.This value is displayed only when a remote SP input is used. It

functions in both Local SP Mode and Remote SP Mode.

Remote SP input is supported only for the E5CC.