Safety I/O Hold Time - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

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
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
ON
Input/output from/to
an external device
OFF
Sending/receiving
ON
data in safety
OFF
communications
• When the safety communications are recovered within the safety I/O hold time
ON
Input/output from/to
an external device
OFF
Sending/receiving
ON
data in safety
OFF
communications
37 FUNCTIONS
660
37.11 Safety Communication Function
Safety refresh
monitoring timeout
System
switching
RM
Tioh
S
H
Safety refresh
monitoring timeout
System
switching
RM
Tioh
S
H
)
H
RM: Safety refresh monitoring time
Safety I/O
Tioh: Safety I/O hold time
hold timeout
S
(1) The safety communications are disconnected.
(2) A safety communication error occurs, and the
(1)
(2)
RM: Safety refresh monitoring time
Safety communications
Tioh: Safety I/O hold time
recovered
S
: Safety data holding time at a system switching
H
For the input values from the external device and
output values to the external device, refer to the
manual for each I/O module.
safety station interlock is triggered.
: Safety data holding time at a system switching
H