Precautions - Mitsubishi Electric M800VW Series Manual

M800V/M80V Series PLC Development Manual
9 Appendix 3: PLC Function
9.1 Enhanced PLC Security Mode

9.1.3 Precautions

Precautions for MTB
(1) If E/U project is output through E/U customization after the project which stores the E/U open interface, the output timing
delays by one scan compared to direct output.
(2) When end users write a sequence program, PLC STOP applies. Take appropriate measures, such as remote I/O initial-
ization function, to ensure secure machine operation when PLC STOP applies.
(3) When an E/U project is empty, PLC can run only with MTB projects.
(4) When an E/U program contains an error, PLC STOP applies, including MTB projects. Take appropriate measures, such
as remote I/O initialization function, to ensure secure machine operation when PLC STOP applies.
(5) In the following cases, the alarm "Z105 end-user parameter error" occurs and PLC STOP applies:
 PLC end-user parameter values and multi-project parameter values do not match
 The range determined by the starting device number of E/U open devices and the total number of devices exceeds the
upper limit
In such cases, the E/U mode is disabled even if the enhanced security mode is enabled.
(6) Since end users cannot set the connection restriction on GX Developer/GX Works2, MTB must determine and set the
connection restriction on GX Developer/GX Works2 (#11094), taking into account whether the end users use GX Devel-
oper/GX Works2.
(7) Since end users cannot make settings for "Writing during RUN", MTB must set for that (#6455 bit6/bit7), taking into
account whether the end users use the function.
(8) If the end user forgets the file password for an E/U program, it will be impossible to delete the E/U program. To avoid this,
create "PROJECTxx.LAD" that stores an empty E/U project ("xx" represents the E/U project number).
(9) When the parameter "#11018 M password hold" is set to "1", the operation is the same as when the MTB password is
input after NC restart even if the MTB password is not actually input. To ensure the security of MTB projects, set #11018
to "0".
Precautions for end users
(1) PLC STOP is needed when files such as sequence programs are written to the E/U project. Ensure safety before per-
forming a write operation.
(2) When an E/U project is empty, PLC can run only with MTB projects.
(3) When an E/U program contains an error, PLC STOP applies, including MTB projects.
(4) When an E/U program is created as a simple project (with label) on GX Works2, devices automatically assigned may not
in line with the limitations on devices. Limit the range of automatic device assignment to the range of E/U open devices.
(5) If the file password for an E/U program is forgotten, it becomes impossible to change or delete the E/U program.
(6) If an E/U program is created with following three conditions, the following error occurs when a write operation to the PLC
is attempted.
The specified device No. exceeds the permissible range. <ES:010a4031>
 The program is created as a simple project (with label) on GX Works2.
 The item "Clear the device ranges set in the Device/Label Automatic-Assign setting to 0 at time of PLC write after a
Rebuild All operation" has been checked.
 Restricted devices for an E/U program are included in the automatic device assignment setting.
When this error is displayed, modify the automatic device assignment setting to an appropriate value, and try a write
operation to the PLC again.
617 IB-1501614-B