KEYENCE DL-RS1A/FD-MH - Manual (Page 17)

15
Communication Response Time
■ T4 (DL-RS1A command processing time)
The processing time varies according to the command sent from the external device.
● Read commands
● Write commands
Communication command
Number of connected
sensor amplifiers
Command processing time (T4)
FD-MH Series
SR
1 14 ms
2 15 ms
3 17 ms
4 18 ms
5 20 ms
6 21 ms
7 23 ms
8 24 ms
9 26 ms
10 27 ms
M0/MS/DRQ input 1 to 10 4 ms
Communication command
Number of connected
sensor amplifiers
Command processing time (T4)
FD-MH Series
SW
1 14 ms
2 15 ms
3 17 ms
4 18 ms
5 20 ms
6 21 ms
7 23 ms
8 24 ms
9 26 ms
10 27 ms
AW
1 57.5 ms
2 58.5 ms
3 60.5 ms
4 61.5 ms
5 63.5 ms
6 64.5 ms
7 66.5 ms
8 67.5 ms
9 69.5 ms
10 70.5 ms
Communication Response Time
■ T5 (Response send time from DL-RS1A)
The time required to send a response varies depending on the communication speed, data bit
length, and number of bytes.
For information on the communication settings, refer to page 2.
The response time can be calculated using the following formula:
T5 = (number of bytes) x (data bit length + 4) / (communication speed)
●
Number of bytes for different commands
SR command : (number of bytes in the read data) + 12
M0 command : {(number of bytes in the read data) + 1} u number of connected sensor amplifiers + 4
MS command : {(number of bytes in the read data) + 3} u number of connected sensor amplifiers + 4
DRQ input
: {(number of bytes in the read data) + 3} u number of connected sensor amplifiers + 4
SW command : 11
AW command : 8
* For information on the number of bytes in the write data and the number of bytes in the read data,
refer to "Parameters of Commands and Responses" (page 10).
Sample calculation
■ T6 (Sensor amplifier settings change time)
For information on the calculation function, refer to the manual supplied with the sensor amplifiers.
● When calculation function of sensor amplifiers is OFF
T6 = 0 ms for SW and AW commands; the sensor amplifiers complete modifying their settings during
the T4 period.
* This table also applies to the sensor amplifiers that do not have the calculation function.
●
When calculation function of sensor amplifiers is ON
SW and AW commands both require the processing time shown below.
Number of bytes Data length Communication speed Response time
21 8 bit 9600 bps 26 ms
114 8 bit 9600 bps 143 ms
21 7 bit 38400 bps 6 ms
114 7 bit 38400 bps 33 ms
Number of connected sensor amplifiers Settings change time (T6)
1 7 ms
2 9 ms
3 13 ms
4 15 ms
5 19 ms
6 21 ms
7 25 ms
8 27 ms
9 31 ms
10 33 ms