Page 70 Milltronics SF 500 - INSTRUCTION MANUAL 7ML19985CN01
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Communications
SF 500 and SmartLinx
®
In addition to three onboard communication ports, the SF 500 is compatible with Siemens
Milltronics SmartLinx
®
communication modules which provide an interface to popular
industrial communication systems.
This section only describes the onboard communications. For more information on
SmartLinx
®
, please consult the appropriate SmartLinx
®
manual.
Connection
There are three serial communication ports on the SF 500:
Refer to
Installation
on page 6 for wiring diagrams specific to each port.
Wiring Guidelines
Improper wiring and choice of cables are the most common sources of communication
problems. Listed below are some suggested guidelines:
• 15 meters (50 feet) for RS-232
• 1200 meters (4000 feet) for RS-485
• Ensure that communication cable is run separately from power and control cables
(i.e. do not tie wrap your RS-232 cable to the power cable or have them in the same
conduit).
• cable is shielded and connected to ground at one end only
• 24 AWG (minimum)
• follow proper grounding guidelines for all devices on the bus
• use good quality communication grade (shielded twisted pairs) cable that is
recommended for RS-232.
WARNING: When a SmartLinx
®
card is installed and P799 = 1
(Communications Control parameter), the parameters that the
SmartLinx
®
card is writing to the SF 500 will be continuously
updated. Therefore, if you connect a SmartLinx
®
card to the SF
500, set P799 = 1 and not write anything to the SmartLinx
®
card,
your setpoints will be 0.
Port Description
1
RS-232, Terminals 31 to 34
2
RS-485, terminals 41 to 46
3
RS-232, RJ-11 modular telephone jack
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