3-4
Section
DeviceNet I/O Link Unit
220
Item
Specification
Model number
CPM1A-DRT21
Master/slave
DeviceNet Slave
Number of I/O points
32 input points, 32 output points
Number of words allocated
in CPU Unit I/O memory
2 input words, 2 output words
(Allocated in the same way as Expansion I/O Units
and other Expansion Units)
Node number setting
Set using the rotary switches
(Set before turning ON the CPU Unit’s power supply.)
Communications current
consumption
30 mA
Indicator
Color
Status
Meaning
MS
Green
Lit
Normal status
Flashing
Switch settings being read
Red
Lit
Fatal hardware error (watchdog timer)
Flashing
Nonfatal error: Incorrect switch settings.
---
OFF
Power not supplied.
Waiting for initialization to start.
Reset in progress.
NS
Green
Lit
Network normal and communications
established.
Flashing
Network normal and communications not
established.
Red
Lit
Fatal communications error: Unit has detected
network status preventing normal
communications.
Node number duplications
Bus OFF detected.
Flashing
Nonfatal communications error: Communications
timeout or communications error for one or more
slaves.
---
OFF
Waiting for node number check by master.
Switch setting error.
Power not supplied.
If an error occurs in the DeviceNet I/O Link Unit, the Error Flags in AR 0200 to
AR 0202 will be turned ON. The addresses of the Error Flags are in the order that
the Expansion Units are connected in the PC, with AR 0200 used for the Expan-
sion Unit closest to the CPU Unit. Use these flags in the program when it is nec-
essary to detect errors.
Usage Procedure
Connect the Unit.
Determine the node number of the
DeviceNet I/O Link Unit and set
the rotary switches.
Wire the DeviceNet transmission
path.
Connect the DeviceNet I/O Link Unit.
The node number should be a unique number between 0 and 63.
Use the DIP switch to set the DeviceNet I/O Link Unit’s baud rate
and the status of output data when a communications error occurs.
Connect the DeviceNet I/O Link Unit to a DeviceNet trans-
mission path.
Specifications
LED Indicators
Handling Unit Errors