4
rd
f Controllers as
recomm
onsiderations
d
h
it safe shut down procedure to ensure safety of personnel.
ICS
eration should be given to the use of an emergency stop function, which is independent of the programmable
al override or other redundant means,
ation should be given to the
res or the inadvertent errors that might be introduced if programs are changed while the equipment is in operation. *
oduced by permission of the National Electrical
Manufacturers Association from NEMA ICS 3-304
6
k of the case, are the ports for connecting to a PLC or some external
15
2.3.1 Connector COM1 [RS232]
equirements
Different cables are required for various devices.
Caution
s and
t of the MT-600/8000 will turn on with each
be used for long lengths or cables run in an electrically
e.
have been inserted all of the way into mating
in assignment of the 9 Pin, Male, SUB-D, COM1 [RS-232] Port.
in Designations
If you, or your company, use any programmable control systems that require
an operator or attendant, you should be aware that this potential safety haza
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 o
ended in the NEMA ICS 3-304 Control Standards.
To conform with ICS Safety Recommendations, checks should be place
in the controller to ensure that all writable registers that control critical
parts of plant or machinery have limit checks built into the program, wit
Programming
C
an out-of-lim
3-304.81 Safety Recommendations:
Consid
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 electromechanic
independent of the programmable controller, for starting and interrupting the cycle.
If provision is required for changing programs while the equipment is in operation, consider
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
failu
z
The ICS 3-304.81 Safety Recommendations are repr
2.3 Communications Connections
The ports as you look at the bac
device (Controller Connectors).
Cable
R
Restrict cable length to less than 500’ (150m) for RS485/422 device
50’ (15m) for RS232 devices to avoid communications problems.
The COM light on the fron
Ethernet communication.
Shielded cable must
noisy environment.
Do not run cables next to AC power lines or near sources of electrical nois
Be sure that the cable ends
connectors and are secure
P
P
COM1 [RS-232]
#
OM1
[RS232]
Pin
Symbol C
1 Not
used
2 RxD Received
Data
3 TxD Transmitted
Data
4 TxD
5 GND
Signal
Ground
6 RxD
7
RTS
Ready to send output
8
CTS
Clear to send input
9 Not
used
