Yokogawa DR240 - Manual (Page 58)

6-4 IM DR231-11E
6.2 Setting Alarms
SA Sets the alarm.
Mode Operation mode
Setting SAp1, p2, p3, p4, p5
p1 Channel number (001 to 560)
Computation channel number (A01 to A60)
p2 Alarm level (1 to 4)
p3 Type of alarm
OFF
No alarm setting
H High limit alarm
L Low limit alarm
dH Difference high limit alarm
dL Difference low limit alarm
RH Rate-of-change limit alarm on
increase
RL Rate-of-change limit alarm on
decrease
p4 Alarm value
p5 Output relay number (Off or relay number)
Example Set the high limit alarm (alarm value=1000) to level
1 of channel 02 of subunit 0 and use relay module 1
in slot 5 of subunit 0 as an output when an alarm is
generated.
SA002, 1, H, 1000, 051
Comments • If the measurement range setting is SKIP, p3 can
only be set to OFF.
• In the following cases, alarm settings in that
channel are all canceled.
Change in the type of input (VOLT, TC .....)
Change in the measurement range
Change in the indicating span or scaling value
when the scaling indication is set (including a
change in decimal point position)
In differential input or RRJC, a change in
reference channel number or type of input/
measurement range
When the computation channel is set to on or
off, or the computational expression or
measuring span is changed
When the wiring method and the input range of
the power monitor module are change
• If contiguous channels are set to p1, the decimal
point in alarm values when the measurement
ranges for set channels differ take the positions
determined for each measurement range (see
Pages 5-7 to 5-9). If the result exceeds the
measurable ranges, an error occurs. For example,
if the channels of measurement ranges 20 mV, 2
V, and type T thermocouple are set to p1 and the
alarm value is set to 10000, the following applies:
• The alarm value for the channel of the 20 mV
measurement range: 10.000 mV
• The alarm value for the channel of the 2 V
measurement range: 1.0000 V
• The alarm value for the channel of the type T
thermocouple: 1000.0
°
C
• Since the measurement range of the type T
thermocouple is -200.0 to 400.0
°
C, an error
occurs. For decimal point positions, see Pages
5-7 to 5-9.
• If p3 is off, the parameters for p4 and p5 are
invalid.
• The dH or dL setting for p3 is effective only when
the input range is a differential input.
• If p3 is set to RH or RL, set the interval with the
XA command.
• The setting ranges of p4 alarm values are given on
Pages 5-7 to 5-9.
• Set the alarm value for the computation channel
within the range of a given recording span.
• Enter the p4 alarm value with up to 6 characters,
excluding the decimal point.
For computation channels, set the alarm value in
no more than 8 digits, excluding the decimal
point.
• Setting the output relay number of a module that is
not connected to p5 causes an error. For details on
how to specify the relay number, see Page 5-4.
• Hysteresis should be set using the XA
command.For optional computation channel, the
hysteresis is fixed to 0.
• For the computation channel the only alarms, that
can be set are the upper limit alarm(H) and lower
limit alarm(L).
• The optional computation channel number for a
stand-alone model is A01 to A30.
XA Performs alarm-related settings.
Mode Setup mode
Setting XAp1, p2, p3
p1 Interval for rate-of-change limit on increase
(1 to 15)
p2 Interval for rate-of-change limit on decrease
(1 to 15)
p3 Alarm hysteresis (0.0 to 1.0)
p4 Retention or no retention of alarm display
ON/OFF
Example Set the interval for the rate-of-change limit on
increase to 10, the interval for the rate-of-change
limit on decrease to 10, and the alarm hysteresis to
0.5% and the alarm display is no retention.
XA10, 10, 0.5, OFF
Comments • This command sets the interval at which to detect
the rate-of-change alarm and hysteresis.
• Set the interval using the measurement period as
the unit.
• Set the hysteresis as a percentage of the
measurement range or scaling range.
• For optional computation channel, the hysteresis is
fixed to 0.
XY Sets the re-alarm for a failure which
recurs.
Mode Setup mode
Setting XYp1, p2
p1 Reflash number (1 to 6)
p2 Off, relay number
Example Set reflash relay 1 to relay module 1 connected to
slot 0 of unit 1.
XY1, 101
Comments • Setting the output relay number in a module which
is not connected to p2 causes an error. For details
on how to specify relay numbers, see Page 5-4.
XN Sets AND/OR of the alarm output
relay.
Mode Setup mode
Setting XNp1, p2
p1 Unit No.
0 to 5
p2 Relay number to be set to AND (01 to 60)
NONE All are OR.
01-XX (XX=01 to 60)
Relays whose numbers are 1 to XX are set to
AND.
6.2 Setting Alarms