7 - 8 WBPEEUI240751C0
I/O Block
First Press
Stop
Press the button once to halt operation. The electronics con-
ducts an orderly shutdown after stop is initiated to prevent any
inadvertent process upsets:
1. Save process configuration.
2. Complete any nonvolatile memory write operations.
3. Deactivate all communication links.
4. Transfer control from the primary electronics assembly to
the secondary assembly in redundant configurations.
5. Force any output channels to their powered off states.
6. Illuminate FAULT.
Second Press
Reset
Press the button a second time to initiate a hardware reset. A
hardware reset is required to recover from a module time-out
or a manual stop (single press). After the hardware reset com-
pletes, the block then begins its startup sequence. Refer to
Startup
StartupStartup
Startup in this section.
NOTE: If the module has already stopped due to an error (i.e., FAULT lit), a sin-
gle press resets the module.
Initialization
Initialization clears block memory and restores a known
default configuration. An initialization first clears nonvolatile
memory, then restores a base set of function codes. An I/O
block can be initialized in two ways: software command or
hardware switch. The Harmony controller will automatically
generate an initialize command when necessary. The special
Table 7 -6. Startup Sequence
Sequence
LEDs
Normal Fault
Status
1 to 8
Block and Field
Power
Digital
Channel
1 Off On All On On All On
2 On Off All On On All Off
3OnOffAllOffOnAllOff
4OnOffOn/Off
1
On On/Off
2
NOTE:
1. Refer to Table 7-2.
2. Refer to Table 7-3.
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