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Reaction Time Section 6-1
6-1 Reaction Time
6-1-1 Reaction Time Concept
The reaction time is the maximum time required for stopping an output, taking
into account errors that may occur in safety chains (logical connections for
creating safety devices, consisting of input devices, control devices including
remote I/O devices, and output devices). The safety distance is found based
on the reaction time.
6-1-2 Input Reaction Time
The input reaction time is the time from when an input terminal signal is
changed until an output is sent to the network. The input reaction time is
determined as follows:
Input reaction time = 16.2 ms + Input ON/OFF delay time
The input reaction time for the safety input logic result of the DST1-
XD0808SL-1 is as follows:
Input reaction time = 22.2 ms + Input ON/OFF delay time
Note For details on reaction times for the entire system, refer to the DeviceNet
Safety System Configuration Manual (Cat. No. Z905).
6-1-3 Output Reaction Time
The output reaction time is the time from when a network signal is received
until the output terminal is changed. The output reaction time is determined as
follows:
Output reaction time (DST1-MD16SL-1) = 6.2 ms
Output reaction time (DST1-MRD08SL-1) = 26.2 ms
Output reaction time (DST1-XD0808SL-1) = 6.2 ms + Output ON/OFF
delay time
Note For details on reaction times for the entire system, refer to the DeviceNet
Safety System Configuration Manual (Cat. No. Z905).
6-1-4 Local Input and Local Output Reaction Times
The DST1-XD0808SL-1 can stop local outputs according to local input status
by using logic operations. In such cases, the Unit can independently calculate
the reaction time.
Local input and output reaction time = 18.7 ms + Input ON/OFF delay
time + Output ON/OFF delay time
Safety
sensor/switch
Sensor/switch
reaction time
Local input or
output reaction
time
Actuator
reaction time
Actuator
DST1-XD0808SL-1
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