P270
The SSI daughter board provides the interface to a DC or Brushless servo motor fitted with an absolute SSI Gray Code encoder or encoder emulation. The encoder port provides high speed differential synchronous serial interface (SSI). This port is opto-isolated to maximise the noise immunity of the system.
The SSI port is programmable so that any number of bits from 1 to 24 can be clocked into the position registers.
If the registration function is to be used then a minimum of 12 bits is required for correct operation.
The SSI daughter board provides a hardware position capture function for both a 5V differential input and a dedicated 24Volt registration input. Transitions of either polarity on both these inputs can be used to record the position of the axis at the time of the event within less than 1 micro seconds. This practically eliminates time delays and avoids interrupting the processor frequently in multi-axis systems. It should be noted however that the SSI system overall does not support this level of accuracy due to delays in clocking data from the encoders.
The servo daughter board provides a 12 bit +/-10V voltage output to drive most servo-amplifiers. The voltage output is opto-isolated as standard to maximise the noise immunity of the system.
Specification |
| Type |
Axis Daughter Board |
| Feedback Device |
SSI standard specification encoder - Configurable to a maximum 24bits |
| Demand Signal |
+/-10V 12bit resolution analogue |
| Registration |
N/A |
| EMC Compliance |
BS EN51000-6-22 : 1999 generic noise immunity standard for industrial environment
BS EN61000-6-4 : 2001 generic emission standard for light industrial environment |
| |
|
| Fits Into |
Maximum Possible |
| MC224 |
16 (with P301 Axis Expander) |
| MC206X |
1 |
| Euro 205x |
1 |
| |
|
| The P201 does NOT fit into the following: MC206, MC2, MC216, MC1, MC204 and Euro205. |
Features
- Opto-isolated differential encoder interface A, B, Z
- 6Mhz maximum encoder edge rate
- Opto-isolated +/-10volt 16 bit analog output
- 2 Hardware registration latches for Z or dedicated registration inputs
- 150mA +5v Power output for encoders
- All signals are fully isolated
- Can be fitted in MC224, MC206X, Euro205x and axis expander modules
- Encoder output pulse generation
Further information see Chapter 4 of technical
reference manual
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