Parker PDHX-E Series, User Manual

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Program Storage
The program memory is battery backed up RAM with memory retention of 10,000 hours. The
RAM has 8K characters available for sequence storage and a write protect facility is
provided.
Programs are stored in variable length buffers and the total length cannot exceed 8K.
Write Protection
A write protection facility is incorporated for the protection of stored sequences and
parameters stored by the SV command. If switch 8 (on top of the drive) is ON then the
memory is not write protected. An attempted SV command when the switch is OFF will result
in the following error message being displayed:
#15 BACKUP RAM IS WRITE PROTECTED
Motion Program Selection
The system may be set up so that no sequence is executed at power-up. In this case
sequence execution would be initiated from the controller over the RS232C.
Alternatively, a single sequence to be automatically executed at power-up can be
programmed. After that sequence is executed, control can pass to another sequence or to
the RS232C interface.
Sequence selection may also be initiated via thumbwheel, RP240, and PLC inputs. Up to 64
user defined sequences can be selected for execution in this way.
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