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Programming
Considerations
ICS 3-304.81 Safety Recommendations:
Consideration should be given to the use of an emergency stop function, which is independent of the programmable
controller.
Where the operator is exposed to the machinery, such as in loading or unloading a machine tool, or where the machine
cycles automatically, consideration should be given to the use of an electromechanical override or other redundant means,
independent of the programmable controller, for starting and interrupting the cycle.
If provision is required for changing programs while the equipment is in operation, consideration should be given to the
use of locks or other means of assuring that only authorized personnel can make such changes.
These recommendations are intended as safeguards against the failure of critical components and the effects of such
failures or the inadvertent errors that might be introduced if programs are changed while the equipment is in operation. *
The ICS 3-304.81 Safety Recommendations are reproduced by permission of the National Electrical
Manufacturers Association from NEMA ICS 3-304
2.3 Communications Connections
The ports as you look at the back of the case, are the ports for connecting to a PLC or some external
device (Controller Connectors).
2.3.1 Connector COM1 [RS232]
Cable
Requirements
Caution
Pin Designations
COM1 [RS-232]
If you, or your company, use any programmable control systems that require
an operator or attendant, you should be aware that this potential safety hazard
exists and take appropriate precautions. Although the specific design steps
depend on your particular application, the following precautions generally
apply to installation of solid-state programmable control devices. In addition,
these precautions conform to the guidelines for installation of Controllers as
recommended in the NEMA ICS 3-304 Control Standards.
To conform with ICS Safety Recommendations, checks should be placed
in the controller to ensure that all writable registers that control critical
parts of plant or machinery have limit checks built into the program, with
an out-of-limit safe shut down procedure to ensure safety of personnel.
Different cables are required for various devices.
Restrict cable length to less than 500' (150m) for RS485/422 devices and
50' (15m) for RS232 devices to avoid communications problems.
The COM light on the front of the MT-600/8000 will turn on with each
Ethernet communication.
Shielded cable must be used for long lengths or cables run in an electrically
noisy environment.
Do not run cables next to AC power lines or near sources of electrical noise.
Be sure that the cable ends have been inserted all of the way into mating
connectors and are secure.
Pin assignment of the 9 Pin, Male, SUB-D, COM1 [RS-232] Port.
Pin#
Symbol
COM1 [RS232]
1
Not used
2
RxD
Received Data
3
TxD
Transmitted Data
4
TxD
5
GND
6
RxD
7
RTS
Ready to send output
8
CTS
Clear to send input
9
Not used
Signal Ground
4
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