Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 139)

Appendix
A
A-1
Selecting Switch Settings
Make the following switch selections for Classic PLC-5 processors.
1. Regardless of this switch setting, outputs are reset when either of the following occurs:
• processor detects a runtime error
• an I/O chassis backplane fault occurs
• you select program or test mode
• you set a status file bit to reset a local rack
2. If an EEPROM module is not installed and processor memory is valid, the processor's PROC LED indicator blinks,
and the processor sets S:11/9, bit 9 in the major fault status word.
3. A processor fault occurs if processor memory (solid red PROC LED) is not valid.
4. You cannot clear processor memory when this switch is on
4 5
2 -slot
1 -slot
1/2- slot
1
Always
Off
19309
6 7
Outputs of this I/O chassis remain in their last state when
a hardware failure occurs. 1
Outputs of this I/O chassis are turned off when a
hardware failure occurs. 1
Pressed in
at top ON (closed)
Pressed in
at bottom OFF (open)
EEPROM memory transfer to processor memory at powerup. 2
EEPROM memory transfers to processor memory if processor memory
not valid.
EEPROM memory does not transfer to processor memory.
3
RAM memory protection disabled.
RAM memory protection enabled.
4
Not allowed
RAM Memory Protection
Switch
8
OFF
ON
EEPROM Transfer
Addressing
Last State
Switch
ON
OFF
Switches
Switches
OFF OFF
OFF ON
ON OFF
ON ON
OFF OFF
ON ON
ON OFF
Chassis Backplane with
Classic PLCĆ5 Processor