Chapter Four: Analog and Digital Interfaces Digital Interface Input and Output Options
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The valid MAC ID switch positions are 0 to 63. Use the switch on the left to set the most significant digit
(MSD), that is, the factor of ten (10, 20, 30...60). Use the switch on the right to set the least significant digit
(LSD), that is, the increments of one (1, 2, 3...9). The switch positions are numbered in a clockwise direction,
to correspond to the increasing address values. (Factory Default is 55.)
Note
Setting the switches to a value that is greater than 63 is the same as setting the rotary switch to
the “PGM” position (the baud rate is read from the non-volatile memory).
Note
The MAC ID switch on the top of the device must be set to the network (PGM) position before
ower up in order for changes to be made over the network. Any changes in the rotary switch
ositions after power up are ignored.
Unrecoverable Fault Condition
A hardware problem with the EEPROM, or a memory problem with the RAM are major unrecoverable faults.
This fault condition sets its exception status bit, and the Module Status LED illuminates solid red, complying
with Volume I of the DeviceNet Specification.
Note
A major unrecoverable fault prevents operation because the device cannot communicate on the
network. Contact MKS Instruments, Inc. for assistance.
Power Up
At power-up, flow device performs checks on its communications link and internal diagnostic checks of the
EEPROM and RAM. The results of these checks are indicated by the color (green or red) and condition (solid
or flashing) of the status LEDs on top of the instrument. The following LED sequence occurs when the MFC
is powered up (times are approximate):
1. The Module Status LED flashes first GREEN for ¼ second, then RED for ¼ second, then turns OFF.
2. The Network Status LED flashes first GREEN for ¼ second, then RED for ¼ second, then turns OFF.
3. The Module Status LED flashes from GREEN to RED for five seconds while the device is initializing.
The Network Status LED remains OFF.
4. The Module Status LED illuminates solid GREEN when initialization is completed.
5. When the device establishes communication with other devices on the network, the Network Status LED
illuminates GREEN.
Note
If the power up LED sequence does not function properly, contact MKS for assistance.
See Table 7: Network Status LED Indicators for more information on the operation of the
etwork Status LED and the Module Status LED.
Warm-Up and Zero the MFC
After installation and power up, allow the MFC to warm up for a minimum of 30 minutes, then refer to the
installation section to Zero the MFC.
Warm Up Time
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