User`s manual

39
CHAPTER 2 USING THE PROGRAMMABLE CONTROLLER CPU MONITORING FUNCTION
2
2.2 About the Programmable Controller CPU Monitoring Function
2.2.3 Timing for programmable controller CPU monitoring
The following explains the timing for programmable controller CPU monitoring when the programmable controller CPU
monitoring function is executed.
(1) Programmable controller CPU monitoring using the Q series C24 is performed
continuously at cycle time intervals registered by the user.
(2) Values from 1 to 65535 (unit: 100ms/s/min) can be registered as the cycle time.
Use the following expressions as a reference when registering the cycle time.
(a) When sending device data or the programmable controller CPU status
Cycle time designation > K + sequence scan time + processing time + data transmission time
(b) When notifying through combined use of the modem function
*1
(when notifying)
Cycle time designation > K + sequence scan time + processing time
+ data transmission time + data transmission delay time of the modem
+ modem connection and disconnection time
(when sending data)
Cycle time designation > K + sequence scan time + processing time
+ data transmission time + data transmission delay time of the modem
+ modem connection and disconnection time + circuit disconnection wait time
*1 When modem initialization has not been performed, the modem initialization time will be added. (We recommend that
the modem initialization be performed in advance.)
The items that appear in the above expressions are explained below:
• K: 60ms constant (internal processing time of the Q series C24)
• Processing time: Processing time for the "Multiple block batch read word unit command 0406"
For 1 point: 11.3ms
For 480 points: 23.4ms
For 960 points: 36.2ms
• Data transmission time = 1 / transmission rate  bit count for one byte portion during transmission  byte
count for transmission data
• Bit count for one byte portion during transmission = 1 + data bit count + parity bit + stop bit count
(parity bit = 1, no parity bit = 0)
• Data transmission delay time by the modem: Depends on the modem specifications, line specifications and
line status.
• Modem connection and disconnection time: Depends on the modem specifications, line specifications and
line status.
• Modem initialization time: Depends on the modem specifications.