LINK Systems 5100-8 Tonnage & Analog Signal Monitor - Manual (Page 77)

Doc #: L-802-1110 Page 75 Rev. 02
9.1.1 “Communication Failure”
If the tonnage monitor is reporting “Communication Failure” in “Module Status” at the bottom of the
tonnage monitor main screen, then the following process should be followed:
1) First, check to see if any other option modules, such as die protection or limit switch, are also
reporting “Communication Failure”. Note that you have to be a little careful when checking for
this. If the 5100-8C option is installed in the tonnage monitor (see section 8.2 on page 71), then
“Communication Failure” will also be reported in the “Module Status” of the die protection and
limit switch channels associated with the tonnage monitor. Check to see if the error is also
reported for the other independent modules.
2) If all other modules are reporting communications failure, then the problem should either be
in the operator terminal, or the high speed bus as a whole. Check for broken or disconnected
high speed bus cable near the operator terminal and that the wires are properly terminated in the
connector. Check that the high speed bus cable is not shorted. Check that the high speed bus
cable is properly terminated (see section 6.5 on page 54).
3) If some but not all other modules are reporting communication failure, then the problem is
likely with one segment of high speed bus cable. Find the segment of high speed bus cable
between the last unit that is working and the first unit that is not. Check that cable segment is
plugged in at both ends and that the wires are properly terminated in the connectors. Check this
segment for broken wires.
4) If no other modules are reporting communication failure, then the problem is likely
connected to just the tonnage monitor. Check that the tonnage monitor has power. Check that
the high speed bus cable is connected to the tonnage monitor and that the wires are properly
terminated in the connector. If the tonnage monitor is at the end of the high speed serial bus,
then verify that the last segment of high speed bus cable to the unit is ok. Check that the high
speed bus cable is properly terminated (see section 6.5 on page 54). If the green “PWR” (power)
indicator on the tonnage monitor is blinking, then the tonnage monitor has a hardware fault.
9.1.2 “CTM F. Comm. Fail”
If the press control or brake monitor screen is reporting “CTM F. Comm. Fail” in the present running
status, then the following process should be followed:
1) First, check to see if the tonnage monitor is showing “Communication Failure” in the “Module
Status” area. If it is, then follow the procedure in section 9.1.1 above.
2) This is a latched error. Reset the error in the press control or brake monitor screen. If the error
does not reset, check again for a “Communications Failure” in the tonnage monitor screen. If it
is, then follow the procedure in section 9.1.1 above.
3) Check the high speed bus cable connections. Verify that the wires are properly terminated in the
connectors. Gently pull on individual wires where they go into the connectors to check for loose
or broken wires.