TOHO ELECTRONICS TTM200 - Manual (Page 116)

48-7009-E 5-46
5.4.9 Concurrent temperature ascent function
■ What the concurrent temperature ascent is
• When a concurrent temperature ascent control is executed for multiple channels using the RS-485
communication function, a target value can be reached for each channel at the same clock time,
disregarding characteristics of each channel through assigning master or slave to the channels.
The channel that requires the longest time for reaching the target value from the start of the control
is assigned as a master and others as slaves.
• The concurrent temperature ascent function is activated when operation starts, including when
power turns on, or setting value is changed, and terminated when the master reaches the target value.
Controller 1 ch Controller 2 ch Controller 3 ch Controller 4 ch
Heater Heater Heater Heater
Sensor Sensor
Sensor
Sensor
Oven
Input Output Input Output Input Output Input Output
• How to use the function
1) Set the communication protocol setting (SEt 17) to TOHO protocol.
2) Set the communication switchover setting (SEt 17) to a concurrent temperature ascent master
for a channel that requires the longest time to reach the target value, and to concurrent
temperature ascent slaves for others.
3) Set the primary control sensitivity setting (SEt 04).
Set the sensitivity to such a degree that no chattering is generated, as the slave sides are
ON/OFF-controlled to the present temperature on the master during concurrent temperature
ascent.
Note Precautions on the use
1) Conduct the auto-tuning for each channel as needed.
2) Do not execute external communication during the use of the concurrent temperature ascent function.