Watlow PM PLUS ™ 6 Series PID Integrated Controller

Solid state relay (SSR) 20-264VAC, 0.5A resistive load, optocoupler isolation, high-precision, low-noise control (such as laboratory equipment)

Universal process output 0-10VDC (minimum load 1k Ω), 0-20mA (maximum load 800 Ω), accuracy ± 0.1% parameter retransmission (such as outputting process values to the recorder), driving proportional valves

(2) Output function allocation

Core functions: heating control, cooling control, alarm triggering, program event output (such as Ramp/Soak step linkage), limit protection output.

Special Features:

Duplex: Single process output simultaneously controls heating/cooling (such as 4-20mA signal, 12-20mA corresponds to heating, 4-12mA corresponds to cooling), suitable for three-way valve control.

Retransmit: Transmit process values/setpoints to other devices (such as PLCs, recorders) through analog outputs, supporting Scale Low/High and Range Low/High configurations.

3. PID Control and Advanced Algorithms

(1) Core control mode

Support multiple control algorithms to adapt to different process requirements:

Basic modes: On Off (switch control), P (proportional), PI (proportional integral), PD (proportional derivative), PID (proportional integral derivative).

Special mode:

Ratio control: maintains a fixed ratio of two inputs (such as fuel/air mixture ratio), suitable for combustion systems.

Differential control: controls the difference between two inputs (such as the temperature difference between the inlet and outlet of a heat exchanger), suitable for temperature compensation scenarios.

Square Root Control: Performing square root conversion on input signals, suitable for flow measurement (due to the square root relationship between flow rate and differential pressure).

(2) Optimization function

Auto Tune: By driving the process with 100% power output, it automatically calculates the optimal PID parameters (proportional band, integration time, differentiation time), supports 90% set point tuning (to avoid overheating risks), and displays "Tuning 1" on the screen during tuning.

TRU-TUNE+ ® (Adaptive tuning): Real time monitoring of process value fluctuations, dynamic adjustment of PID parameters, adaptation to load changes (such as increased material during heating), supporting 1-6 levels of gain (level 1 is the most sensitive, level 6 is the most stable).

Manual tuning: The proportional band (0.001-9999.000 ° F/° C), integration time (0-9999 seconds), and differentiation time (0-9999 seconds) can be manually adjusted, suitable for complex processes that Auto Tune cannot meet.

4. Program control (Ramp/Soak)

Support 4 program files, each with 10 steps, to achieve automated process curve control (such as material annealing, food sterilization):

(1) Basic Program Configuration

Global settings:

Slope type: time mode (from current value to target value within a fixed duration), rate mode (heating/cooling by ° F/° C per minute).

Program type: Set point trigger (based on controller set point start), process value trigger (based on sensor detection value start).

Guaranteed Soak Deviation: 0.0-9999.000 ° F/° C, the process value needs to enter the deviation zone before timing starts to ensure process uniformity.

(2) Step type and editing

Step Type Function Description Configuration Items

Time: Ramp up to the target value, target set point, hour/minute/second according to the set time

Soak to maintain target value for a fixed duration and event output status (On/Off)

Wait for Event: Wait for digital input to trigger (such as external switch closed), trigger source (DIO 5/6), trigger status (On/Off)

Wait for Process Value: Wait for the process value to reach the target value, target value, and deviation band

Jump to the specified step and repeat the target step number and number of repetitions (0=infinite loop)

End: After the program ends, execute the action. End type (Off/Hold/User, such as Hold maintaining the last set point)

(3) Program startup and control

Startup methods: manual panel startup (Operations → Profile → Profile Start), function key triggering (pre configured), digital input triggering (DIO 5/6), remote communication startup (such as Modbus command).

Operation monitoring: The main screen displays the current step, remaining time, target set point, and supports pause/resume/terminate operations.

5. Communication and Data Interaction

Support multi protocol communication for easy integration into industrial control systems (such as PLC, SCADA):

(1) Communication Protocol and Parameters

Protocol type interface and parameter applicable scenarios

Modbus ®  RTU EIA-485/232， Address 1-247, baud rate 9600/19200/38400bps, parity check Non/Even/Odd small network (such as 16 controllers networking)

Modbus ®  TCP Ethernet interface, supports DHCP/fixed IP, 10/100Mbps large factory network, remote monitoring and configuration

EtherNet/IP ™ Compatible with ODVA standard, supports implicit/explicit communication, input/output assembly up to 40 members Rockwell PLC integration

DeviceNet ™ Node address 0-63, baud rate 125/250/500kbps, supports Quick Connect industrial field equipment networking (such as sensors and actuators)

PROFIBUS DP address 0-126, baud rate 12Mbps max, supports DP-V0/DP-V1 Siemens PLC integration, high-speed real-time control