Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 9)

1-3
IM 04L31A01-01E
Principles of Operation
1
Calculation Function
The CX1000/CX2000 performs differential computation, linear scaling, and square roots
using a microprocessor on the CPU board.
Measurement Alarm Function
The following eight alarm types can be set.
High limit (H), low limit (L), differential high limit (h), differential low limit (l), rate-of-
change on increase (R), rate-of-change on decrease (r), alarm delay upper limit alarm
(T), or alarm delay lower limit alarm (t).
Control Alarm Function
The following nine alarm types can be set.
PV high-limit, PV low-limit, Deviation high-limit, Deviation low-limit, Deviation high & low
limit, SP high-limit, SP low-limit, Output high-limit, Output low-limit
Other Functions
• Communication Function:
Ethernet (standard)
RS-232/RS-422A interface added (optional).
• Remote Function:
The trigger, start/stop, time adjustment, and other functions can be controlled
remotely (optional).
• Measurement Alarm Relay:
Measurement alarm output and memory end/fail output (option for CX1006 and
CX2000).
• Transmitter Power Supply:
DC24 V output for transmitter (only CX2000’s optional).
• VGA Out Function (Option for CX2000 Only):
The instrument's screen can be displayed on an external monitor via VGA output.
• Control - Purpose DIO (CX2000 Only):
Contact input
Input for designated operations such as start/stop. Activate using a no-voltage
contact or open collector signal. This is a 12-point input.
Contact output
Control Alarm output consists of 12 points of transistor contact output.
Control Output Section
Control Output
The following types are available for universal control output.
• Current output (continuous PID control output)
Continuously output a current (analog signal) proportional to the calculated PID values.
• Time proportional PID voltage pulse output
Output an ON/OFF signal, having a pulse width proportional to the time, as a voltage
per the calculated PID values.
• On/Off control relay contact output
• Output an ON/OFF signal, having a pulse width proportional to the time, at a relay
contact point per the calculated PID values.
• Output an ON/OFF signal to a relay contact point corresponding to the sign (+/–) of
the deviation in the measured value from the specified target value.
Contact Input
Input for designated operations such as start/stop. Activate using a no-voltage contact
or open collector signal.
Contact Output
Control Alarm output consists of relay contact output and transistor contact output.
1.2 Input Section