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37 FUNCTIONS
37.11 Safety Communication Function
Safety I/O hold time
The safety I/O hold time (Tioh) is the time until safety communications are disconnected (the safety output is turned off) after
detection of a timeout for the safety refresh monitoring time of safety communications.
Safety I/O Hold Time Setting
The safety I/O hold status of each safety connection can be checked with SA\SD1600 to SA\SD1663 (safety I/O hold status of
each safety connection).
To prevent the safety communications from disconnecting at a system switching, configure the following setting.
Safety I/O hold time (Tioh) > Safety data holding time at a system switching (S
H
)
For the safety data holding time at a system switching, refer to the following.
MELSEC iQ-R CC-Link IE Field Network User's Manual (Application)
The following figures show the relationship between the input/output of the external device and sending/receiving data in
safety communications.
• When safety communications are not recovered within the safety I/O hold time
• When the safety communications are recovered within the safety I/O hold time
RM: Safety refresh monitoring time
Tioh: Safety I/O hold time
S
H
: Safety data holding time at a system switching
(1) The safety communications are disconnected.
For the input values from the external device and
output values to the external device, refer to the
manual for each I/O module.
(2) A safety communication error occurs, and the
safety station interlock is triggered.
RM: Safety refresh monitoring time
Tioh: Safety I/O hold time
S
H
: Safety data holding time at a system switching
OFF
ON
OFF
ON
(1)
(2)
S
H
Tioh
RM
Input/output from/to
an external device
Safety refresh
monitoring timeout
System
switching
Safety I/O
hold timeout
Sending/receiving
data in safety
communications
OFF
ON
OFF
ON
S
H
Tioh
RM
Input/output from/to
an external device
Safety refresh
monitoring timeout
System
switching
Safety communications
recovered
Sending/receiving
data in safety
communications
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