Advertisement
3--7
Selection of Write Modes
Backup Mode
Communications board
Keys
(Local mode)
RAM Write Mode
Communications board
Relationship between Write Mode Switching and Remote/Local Modes
The set value data sent from the computer or the sequencer is internally
stored in the E5AF/E5EF, which has a non-volatile memory and a RAM. The
set value is stored in the non-volatile memory even when power is turned off.
The RAM, however, should be used instead of the non-volatile memory if the
set value must be changed frequently while operating the E5AF/E5EF.
The E5AF/E5EF has two kinds of write modes (backup mode and RAM write
mode), either of which can be chosen for data storage.
When power is turned on, the E5AF/E5EF enters its backup mode automati-
cally. Changing the mode is possible with communications commands only.
The selection of write modes are explained as follows:
In the Backup mode, all set values are stored in the non-volatile memory and
the RAM. This mode should not be selected if the value you set must be
changed frequently (more than a few times a day in single value control oper-
ation, for example) while operating the E5AF/E5EF.
The E5AF/E5EF automatically enters its Backup mode each time power is
ON. The non-volatile memory stores data when E5AF/E5EF is in local mode.
The following block diagram shows the condition of data storage for both
Backup mode and Local mode:
CPU
In the RAM write mode, all set values are stored in the RAM while power is
on. This mode should be selected if the value you set must be changed fre-
quently (in program control operation, for example). Any set value stored in
the RAM is lost when the power is turned off. Any set value written in this
mode will not be backed up. Use the RAM data all save function to store it.
The following block diagram shows data storage in the RAM write mode.
CPU
Switching from the Remote mode to the Local mode or vice versa does not
affect the write mode that has been already set. Any values that have been
set are automatically stored in the non-volatile memory when the mode is
switched from the Remote mode to the Local mode. In the Local mode, val-
ues are stored in the non-volatile memory regardless of the write mode that
has been selected.
Section 3--7
Non-volatile memory
R A M
Non-volatile memory
RAM data all save
R A M
Advertisement
