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4.3 Commonly Asked Questions
Q. Can I have multiple MMI’s connected to one Controller?
A. The ability to connect more than one MMI to a PLC depends on the type of
serial interface the PLC has. PLCs with RS232 communications cannot be net-
worked due to the nature of RS232 signal requirements. PLCs with RS485 or
RS422 can be networked, but, not all of these PLCs support networking. The MMI
supports networking on a limited number of PLCs.
Q. Can I download a recipe?
A. Yes. To do this chain Special messages together with the recipe values as
constants. Do not assign any message text to these messages. The recipe
download can then be activated by Function key or MTR.
Q. Can I Have My PC and MMI connected to the PLC at the same time?
A. No, there will be a conflict with communications. Note: The PC port is NOT a
pass through port to the PLC.
Q. Do I need to change any jumpers to go from one PLC type to another?
A. No. The PLC type is determined by the driver that is downloaded into the MMI at
programming time. Make sure the PLC Type matches the SMIC adaptor cable
type.
Q. Is there any way to completely erase the MMI memory?
A. Yes. The MMI memory can be initialized by the following procedure.
Caution!
All Message and Driver programming will be erased!
Make sure you want to do this!!!
1. Remove power from the MMI.
2. Hold the lower most right and left-hand keys (the CLR and NUM keys for MMI-
210, 220 and 240) down.
3. While holding the two keys down, apply power to the MMI.
4. When the MMI displays “INITIALIZING ALL MEMORY”, you can release the
keys. (The MMI-200 will begin to flash its LED's in sequence.)
The MMI must now be reprogrammed using the PC software.
Q. How do I change the Battery?
A. There is none! The MMI requires no routine maintenance.
Q. I have created a project for one type of PLC. Can I convert this project
for use with another PLC type?
A. Yes! Simply start a New project and use the utility "PLC2PLC" in
MMISoft
setup software under the
Options|Launch Utilities
menu to reassign your tags to
the new PLC registers.
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