137
Troubleshooting I/O Communication
Section 7-3
Note n = CIO 1500 + (25 x unit number).
PROFIBUS-DP Master Unit
is configured. All slaves
were in data exchange, but
all outputs are now set to
zeros. Inputs can still be
read.
The Master Unit is in CLEAR mode.
• The BST LED indicator is Flashing.
• The CLEAR switch has been set in the
Switch word 1 (CIO Word n, bit 02, see
Note)
• The Unit has been configured for Auto-
CLEAR and an error occurred on the Net-
work with one or more slave stations.
• If Auto-CLEAR is enabled, correct the net-
work problem first.
• Set OPERATE switch in CIO Word n (see
Note) to force the Unit to the OPERATE
mode.
PROFIBUS-DP Master Unit
is configured. All slaves are
in data exchange, but the
outputs of some Slave sta-
tions are not updated.
The specified slave stations may be in Sync
mode.
Send a Global_Control Unsync command to
the targeted slave or group of slaves. Use
either the Global_Control feature in CIO
Words. Refer to
4-2-2 Global_Control Mes-
sage (Word n+2)
.
The specified slave station may have its
watchdog disabled and is disconnected from
the network, due to a cabling problem.
• BF LED indicator is Flashing.
• CIO Words n+9 to n+16 (see Note) show
which slaves have problems.
• Use CX-Profibus and DTMs to determine
slave diagnostics.
Verify that the specified slave station is still
connected to the network.
PROFIBUS-DP Master Unit
is configured. All slaves are
in data exchange, but the
inputs of some Slave sta-
tions are not updated.
The specified slave stations may be in Freeze
mode.
Send a Global_Control Unfreeze command
to the targeted slave or group of slaves. Use
either the Global_Control feature in CIO
Words. Refer to
4-2-2 Global_Control Mes-
sage (Word n+2)
.
The specified slave station may have its
watchdog disabled and is disconnected from
the network, due to a cabling problem.
• BF LED indicator is Flashing.
• CIO Words n+9 to n+16 (see Note) show
which slaves have problems.
• Use CX-Profibus and DTMs to determine
slave diagnostics.
Verify that the specified slave station is still
connected to the network.
Problem Probable cause Correction
To Next Page
Loading...
