Mitsubishi Electric MR-D30 Instruction Manual page 82

4. SAFETY OBSERVATION FUNCTION
(3) Duplication of the input wiring
(a) Duplication of the input wiring
Switch DI_A and DI_B within the mismatch permissible time.
This function continuously monitors whether signals of duplicated input are matched. The
corresponding input device will be processed as off when a mismatch is detected. The following
shows the operation sequence when SLS1C (SLS1 command) is assigned to DI1. SLS1C (SLS1
command) is off while DI1A and DI1B are mismatched. SLS1C (SLS1 command) is on when both
DI1A and DI1B turn on. When the mismatch continues exceeding the mismatch permissible time
specified by the parameter, [AL. 79.7 Mismatched input signal error] occurs and SS1 function
operates.
DI1A
DI1B
SLS1C
(SLS1 command)
Servo amplifier
display
Operation status
(b) Parameter setting
For the input devices that are assigned by [Pr. PSD02 Input device selection DI1] to [Pr. PSD07
Input device selection DI6], set the following parameters. Setting the mismatch permissible time to 0
disables the diagnosis.
(4) Fixing-diagnosis at start-up
This function diagnoses that each input pin has no failure by repeatedly turning the signals on and off
when the power to MR-D30 is switched on.
An error will not occur when the
mismatch time is within
the permissible time.
ON
OFF
ON
OFF
ON (disabled)
OFF (enabled)
SLS in progress
Parameter
PSD18 Mismatch permissible time DI1
PSD19 Mismatch permissible time DI2
PSD20 Mismatch permissible time DI3
PSD21 Mismatch permissible time DI4
PSD22 Mismatch permissible time DI5
PSD23 Mismatch permissible time DI6
4 - 11
Input device
Mismatch permissible time
No display
Normal
SLS in progress
operation
Name
79.7
SS1 in progress