MKS P9B, Instruction Manual, Page: 51 / 112

Digital Interface Input and Output Options Chapter Four: Analog and Digital Interface
41
DeviceNet Controls and Indicators
The top panel of the MFC contains several DeviceNet controls and indicators.
The mass flow device has two standard bi-color (green/red) DeviceNet status LEDs, (Module Status LED and
Network Status LED) located on top of the instrument. The power-up sequence of these LEDs conforms to
the requirements in the ODVA DeviceNet Specification, Volume 1 [1].DeviceNet Network Status LED
(MOD & NET)
The Network Status LED indicates the status of the communications link. If no problems are detected, the
Network Status LED illuminates a solid green. A red, dark, or flashing green Network Status LED indicates a
fault condition on the network.
Table 11: Network Status LED Indicators
LED Status Meaning
Solid Green Communications link is OK.
The device is online and connections are established.
Flashing Green The device is online but no connections are established.
The device has passed the Dup_MAC_ID test and is online, but has no established
connections to other nodes.
Solid Red Critical link failure.
The device has detected an error that prevents network communication (Duplicate
MAC_ID or bus-off.).
Dark
Not powered / Not online.
The device has not completed the Dup_MAC_ID test, or the device is not powered;
check the module status LED.
DeviceNet Baud Rate and MAC ID Switches
The baud rate and MAC ID (node address) for your device can be set through software commands using
standard DeviceNet protocol over the network, or manually using the rotary switches located on the top panel
of the device. The baud rate and MAC ID switches allow you to easily configure units without an operational
network, or to network multiple units quickly.
The baud rate and MAC ID rotary switches support an assigned
network
position, labeled on the device as
“PGM” to indicate software operation.
If the rotary switch is in the network (PGM) position at power-up, the baud rate or address is read from the
non-volatile memory. Any changes to the values must be made over the network; any changes in the rotary
switch positions after power-up are ignored.
If the rotary switch is
not
in the network (PGM) position at power-up, the baud rate or address is read directly
from the switches.
Note
The DeviceNet General Error Codes are listed in the ODVA DeviceNet Specification,
Volume 1 [1].
DeviceNet Baud Rate Switch
The 4-position rotary switch is used to select the DeviceNet baud rate. The choices are: PGM (the baud rate is
read from the non-volatile memory), 125, 250, and 500 Kb. 500 Kb is the factory default.