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OPERATING PROCEDURES
NORMAL OPERATING CONDITIONS
WBPEEUI240759A0
5 - 3
NORMAL OPERATING CONDITIONS
In order for the EDI module to operate, an MFP module must
be inserted into the MMU and be in execute mode before the
EDI module. The EDI module requires this since the MFP mod-
ule provides the I/O expander bus clock and contains the EDI
module configuration. If an MFP module is not present, the
EDI module will red light. If this occurs, insert the MFP module
and reset the EDI module.
The MFP module notifies the EDI module when it transitions
from configure to execute mode. This notification triggers the
EDI module to read the MFP function codes (FC 184 to FC 188)
and configure the appropriate protocol messages. When the
MFP module transitions from execute to configure, the EDI
module continues to read from the PLC but stops sending data
to the PLC.
If the MFP module is stopped, reset, or removed, the EDI mod-
ule will red light. If the EDI module is removed, a problem
report will be generated by the MFP module.
Table
describes the operation of the EDI module in rela-
tionship to the MFP module operating mode.
STOP/RESET
The stop/reset button is used to interrupt module execution
and to initiate a hardware reset. The button is accessed
through the small opening on the front panel. Some type of
thin rod, preferably nonmetallic, is required to press the
button.
1st Press
Press the button once to halt operation. The electronics con-
ducts an orderly shutdown after stop is initiated and turns on
the red module state indicator.
Table 5-3. Operations Summary
MFP Mode
EDI Condition
EDI Operation
Execute
Power on (start-up)
1. Read configuration from MFP
module (flashing green LED).
2. Execute (solid green LED).
Configure
to execute
Normal operation
(solid green LED)
1. Reset.
2. Read configuration from MFP
module (flashing green LED).
2. Execute (solid green LED).
Execute to
configure
Normal operation
(solid green LED)
Monitors input values but does not
send data.