Precautions On Dedicated Instructions - Mitsubishi Electric MELSEC-L02SCPU User Manual

7.12.2

Precautions on dedicated instructions

(1) Multiple instruction executions
(a) Axis 1 start instruction (SM1848) and execution of instructions
When the Axis 1 start instruction (SM1848) is on, any attempt to perform positioning of the same axis by each
of the following instructions is ignored. (If an instruction to start positioning is executed again after the Axis 1
start instruction (SM1848) has turned off, positioning starts even when the Axis 1 start during operation
(SM1847) is on.)
• IPPSTRT1(P)
• IPDSTRT1(P)
• IPSIMUL(P)
• IPOPR1(P)
• IPJOG1
• IPABRST1
(b) Multiple executions during one scan
If each of the following instructions is used multiple times on the same axis during one scan, normal operation
cannot be guaranteed.
• IPJOG1
• IPSTOP1
(2) Program executed only once and execution of instructions
If the following instructions are executed in a program which is executed only once, turning off of execution
commands cannot be detected and thus normal operation is not possible. Use these instructions in a program
where turning off of execution commands can be detected (such as a scan program).
• IPJOG1
• IPSTOP1
(3) Axis 1 axis operation status (SD1844) and execution of instructions
If the IPSTOP1, IPSPCHG1(P) or IPTPCHG1(P) is executed while the Axis 1 axis operation status (SD1844) is
indicating one of the following values, the instruction is ignored:
• Standing by (0)
• Stopped (1)
• Error occurring (-1)
• Decelerating (axis stop ON) (7)
• Decelerating (JOG start OFF) (8)
• Analyzing (11)
(4) Instructions not requiring execution command
The following instructions are always executed, which means that they are executed even when their execution
command is off. Therefore, errors can occur even while an execution command is off.
• IPJOG1
• IPSTOP1
CHAPTER 7 POSITIONING FUNCTION
7
161