Setting device bus address

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Revision as of 13:18, 5 January 2013 by Tero K (Talk | contribs) (Argon)


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All SimpleMotion V2 compatible devices have a settable address that identifies the device on a multidrop communication bus. Each device sharing the same bus must have an unique address number to make error free communication possible. For example configuring bus address is required to establish a connection with Granity software.

Setting bus address

The method of how address is set depends on device hardware implementation. This chapter lists methods for Granite Devices products.

Argon

DIP switch of Argon. In this case the DIP has value 01001.

Argon (servo drive) has a 5 channel DIP switch that sets the address. The table below lists all possible settings of DIP switch settings. Switches 1-4 set the address and the switch number 5 sets termination on or off.

Address Bus termination DIP switch setting (switches from 1 to 5)
255 (firmware upgrade mode) Off 00000
255 (firmware upgrade mode) On 00001
1 Off 00010
1 On 00011
2 Off 00100
2 On 00101
3 Off 00110
3 On 00111
4 Off 01000
4 On 01001
5 Off 01010
5 On 01011
6 Off 01100
6 On 01101
7 Off 01110
7 On 01111
8 Off 10000
8 On 10001
9 Off 10010
9 On 10011
10 Off 10100
10 On 10101
11 Off 10110
11 On 10111
12 Off 11000
12 On 11001
13 Off 11010
13 On 11011
14 Off 11100
14 On 11101
15 Off 11110
15 On 11111

Bus termination

Proper configuration of devices on a bus
SimpleMotion V2 bus must be terminated for reliable communication. This means that last device of the bus must have termination DIP switch set to On position.

Bus may be also alternatively terminated with external 100 ohm resistor connected between RS485_A and RS485_B wires at the end of bus cable chain (see SimpleMotion V2 port). If DIP switch termination is used, then drive internal 100 ohm resistor is connected across the A and B wires.

Stub

If an E-stop button is connected with RJ45 cable after the last device, a bus stub is formed. Stub must not be longer than 30 cm or 1 foot to ensure bus operation.

Methods to elimiate the stub on E-stop cable:

  • Cut the A and B wires (orange and orange/white) from the cable near connector and leave only the E-stob button wires left (green/white and blue/white)
  • Alternatively, connect termination resistor at end of A and B pair and leave DIP switch termination off.

Troubleshooting

Following errors may cause unreliable connection:

  • If two or more devices have same address on a single bus
  • If termination is missing or is present multiple times
  • If bus stub is too long

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