Difference between revisions of "Setting device bus address"

Revision as of 22:40, 16 June 2013 (edit) Tero K (Talk | contribs) (→‎Stub) ← Older edit		Revision as of 18:35, 6 August 2013 (edit) (undo) Tero K (Talk | contribs) (→‎Stub) Newer edit →
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	===Stub===		===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.	+	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 reliable bus operation.
−	Methods to elimiate the stub on E-stop cable if longer than 30cm E-stop cable is needed:	+	Methods to eliminate the stub on E-stop cable if longer than 30cm E-stop cable is needed:
	*Cut the A and B wires from the cable near connector or leave only the E-stop & enable button wires and GND left		*Cut the A and B wires from the cable near connector or leave only the E-stop & enable button wires and GND left
	*Alternatively, connect termination resistor at end of A and B pair and set DIP switch termination off		*Alternatively, connect termination resistor at end of A and B pair and set DIP switch termination off

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Revision as of 18:35, 6 August 2013

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

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

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 reliable bus operation.

Methods to eliminate the stub on E-stop cable if longer than 30cm E-stop cable is needed:

• Cut the A and B wires from the cable near connector or leave only the E-stop & enable button wires and GND left
• Alternatively, connect termination resistor at end of A and B pair and set 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