4
Programming
Considerations
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.
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. *
z
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], COM1 [RS485 4/2W], COM3 [RS485]
Cable
Requirements
Different cables are required for various devices.
Caution
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-6050iV3 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] / [RS-485],
COM3 [RS-485] Port. Only Com1[RS485 2W] supports MPI 187.5K.
Pin Designations
COM1 [RS-232]
COM1 [RS-485]
COM3 [RS-485]
Com1[RS485]
Pin# Symbol
4 wire
2 wire
Com1[RS232] Com3[RS485]
1 Rx- Rx-
Data-
2 Rx+ Rx+
Data+
3 Tx- Tx-
4 Tx+ Tx+
5 GND
GND
6 TxD
Transmit
7 Data-
Data-
8 Data+
Data+
9 RxD
Receive
