Contatto
MCP 4 – User's manual
DUEMMEGI
6- DIAGNOSTICS
6.1- Diagnostics of
CONTATTO
system through MCP 4
MCP 4 module provides the failure warning through two red LEDs on the front panel.
The red LEDs
report the alarms related to module failure (
MOD.F
) and bus failure (
BUS.F
). The MOD.F
signaling occurs after 5 seconds delay time in respect to the moment of the failure of a module. The search
of fault modules may be done using the MCP IDE software package, primarily displaying the map of the plant
on MCP VISIO.
If both
MOD.F and BUS.F LEDs lights in continuous mode
, this means that MCP 4 memory is not
correctly programmed.
If a BUS FAILURE occurs, the bus connections have to be checked. This failure appears when MCP 4 is not
able to transmit on the bus (L1 and L2).
Two green LEDs
on MCP 4 panel report the bus activity: the
POLL
led shows the start of the polling cycle
and it blinks at a frequency inversely proportional to the number of configured modules (with few connected
modules this LED may seem to be fixed ON).
The
VAR
led shows, through a flsh, the occurrence of a status change on one or more input modules.
If the VAR LED remains ON for a long time (greater then 2 seconds), then two or more modules of the same
type (IN or OUT) have the same address; in this case use MCP VISIO utility to find the doubled addresses
(the doubled modules are displayed on the screen in yellow color). The doubled addresses signaling,
however, cannot be assured, because if the answer of the two modules is exactly superimposed each one to
the other, then MCP 4 cannot detect the anomaly.
During the firmware update of the main microcontroller inside MCP 4 the two red LEDs flash alternately, while
during the firmware update of the secondary microcontroller the two green LEDs flash alternately.
Three pairs of LEDs (red and yellow) on the front panel of MCP 4 allow to monitor the activity, if any, on the
related serial ports RS232 and RS485.
The following table resumes the signaling in the various operating status:
Operating status
POLL
VAR
BUS.F
MOD.F
Normal
Periodic blinking
Flash at the
occurrence of a
change on an
input module
Fixed OFF
Fixed OFF
Module failure
Periodic blinking
Flash at the
occurrence of a
change on an
input module
Fixed OFF
Fixed ON
Double address
Periodic blinking
ON for long time
Fixed OFF
X
Bus failure
Fixed OFF
Fixed OFF
Fixed ON
Fixed OFF
FLASH not programmed
Simultaneous periodic blinking
Fixed ON
Fixed ON
Update of main microc. or
FW not valid
Simultaneous periodic blinking
Alternate blinking
Update of secondary
microc. or FW not valid
Alternate blinking
X
X
Note:
The frequency of periodic blinking of POLL may be so high that LED seems to be fixed ON.
X = don’t care.
Page 52 of 87
Rel.: 1.2 October 2018
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