Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 49)

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M-4659
Configuring the DX1000/DX2000
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Index
Relay hold
Select the alarm output relay behavior from below: The setting applies to all relays.
Settings Description
Unhold Turns the output relay OFF when the alarm condition is released (returns to
normal condition).
Hold Holds the output relay at ON until an alarm acknowledge operation is performed.
Relay Action on ACK
You can select this with DX main unit firmware version 2.0x or later.
Settings Description
Normal The relay output is deactivated when the alarm ACK operation is executed. If the
condition for activating the alarm output relay is met in the next scan interval, the
relay output is activated.
This operation is valid only when the alarm output relay is set to [Hold].
Reset The relay output is deactivated when the alarm ACK operation is executed. If a
new condition for activating the alarm output relay, the relay is activated.
Note
When reflash is turned ON, the operation of the first three output relays is set to nonhold.
Specifying Hold produces no effect.
Measure channel High/Low
Sets the hysteresis width of the alarm occurrence/release of the high/low limit alarm
specified on measurement channels.
Selectable range: 0.0% to 5.0% of the span or scaling width
Measure channel Delta High/Low
Sets the hysteresis width of the alarm occurrence/release of the difference high/low limit
alarm specified on measurement channels.
Selectable range: 0.0% to 5.0% of the span
Math channel High/Low, Ext channel High/Low
Sets the hysteresis width of the alarm occurrence/release of the high/low limit alarm
specified on computation and external input channels.
Selectable range: 0.0% to 5.0% of the measurement span
Scan Interval
Scan interval
Select a scan interval.
A/D integrate
Select the A/D integration time as necessary. Only the selectable settings are displayed.
Settings Description
Auto The DX automatically detects the power supply frequency and sets the integration
time to 16.7 ms and 20 ms for 60 Hz and 50 Hz, respectively. Fixed to 20 ms on /
P1 models that use the 24 VDC power supply.
50Hz Sets the integration time to 20 ms.
60Hz Sets the integration time to 16.7 ms.
100ms Sets the integration time to 100 ms (when the scan interval is 2 s or 5 s).
600Hz The A/D integration time for fast sampling mode. You cannot change this value.
You cannot use fast sampling mode on models with the external input channel (/
MC1) option.
3.6 Entering Basic Settings