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NOVA electronics Inc.
MCX514 -
50
-
50
-
2.5.5
Execution of Automatic Home Search and the Status
■
Execution of automatic home search
An automatic home search is executed by automatic home search execution command (5Ah). It will be started by writing the
command code 5Ah to WR0 register after correctly setting the automatic home search mode and speed parameter.
■
Suspension of automatic home search
In order to suspend automatic home search operation, write decelerating stop command (56h) or instant stop command (57h). The
step currently being executed is suspended and the automatic home search is terminated.
When the timer between steps is enabled and stop command is written during the timer operation, the timer is also suspended and
the automatic home search is terminated.
■
Status register
D3~0 bits (n-DRV) of the main status register RR0 indicate driving is in execution. The bits also indicate the automatic home
search is in execution. When an automatic home search starts, the bit of execution axis is set to 1 and the state is maintained from
the start of Step 1 operation to the end of Step 4 operation. At the termination of Step 4, the bit is reset to 0.
If an error occurs during the execution of automatic home search, D7
~
4 bits (n-ERR) of execution axis in RR0 register becomes
1. The error factor will be displayed in D6~D0 bits of RR2 register as shown below.
D7
D6
D5
D4
H
L
D15
D14
D13
D12
D11
D10
D9
D8
D3
D2
D1
D0
RR2
SLMT+
SLMT-
HLMT+
HLMT-
ALARM
EMG
HOME
For more details of each error factor, see chapter 6.13.
D14~D9 bits (HSST5
~
0) of RR3 register Page0 indicate the automatic home search execution state by number. The user can
check the operation currently being executed.
D7
D6
D5
D4
H
L
D15
D14
D13
D12
D11
D10
D9
D8
D3
D2
D1
D0
RR3
HSST0
HSST1
HSST2
HSST3
HSST4
HSST5
Automatic Home Search
Execution State
Table 2.5-9 Automatic Home Search Execution Status
Execution state
Execution step
Operation details
0
Waits for automatic home search execution command
3
Step 1
Waits for activation of a detection signal in the specified search direction
6
The timer is running between Step 1 and Step 2.
11
Step 2
Waits for activation of a detection signal in the direction opposite to the
specified search direction (irregular operation)
15
Waits for deactivation of a detection signal in the direction opposite to the
specified search direction (irregular operation)
18
The timer is running after irregular operation
20
Waits for activation of a detection signal in the specified search direction
23
The timer is running between Step 2 and Step 3, or deviation counter clear is
outputting
28
Step 3
Waits for activation of nSTOP2 signal in the specified search direction
32
The timer is running between Step 3 and Step 4, or deviation counter clear is
outputting.
36
Step 4
Offset driving in the specified search direction
Error
Automatic home search is in execution
X-DRV
D7
D6
D5
D4
H
L
D15
D14
D13
D12
D11
D10
D9
D8
D3
D2
D1
D0
RR0
Y-DRV
Z-DRV
U-DRV
X-ERR
Y-ERR
Z-ERR
U-ERR