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Scale interface (3 × 15W HDD sockets)
UCC MMI-2 provides a digital interface for Renishaw digital incremental encoders.
UCC MMI-2 can also be used with compatible 3rd party encoders.
Connector details
The ports use 15-way high-density 'D' sockets. The connections for the sockets are shown in the table below.
NOTE: If the machine scale is of a different format (e.g. analogue, single-ended) then this will require an external adaptor.
Pin no. | Function |
|---|---|
| 1 | Reserved |
| 2 | 0 V scale supply |
| 3 | Error - |
| 4 | Reference mark - |
| 5 | B signal - |
| 6 | A signal - |
| 7 | +V scale supply |
| 8 | +V scale supply sense |
| 9 | 0 V scale supply sense |
| 10 | /Limit switch Q/ (active low) |
| 11 | Error + or /limit switch P/ (active low) |
| 12 | Reference mark + |
| 13 | B signal + |
| 14 | A signal + |
| 15 | 0 V scale supply (inner screen) |
| Shell | Screen |
+V scale can be adjusted independently for each scale interface port.
If the scale power sense wires are connected to the respective scale power supply signals at the readhead, the voltage will automatically adjust to maintain +5 V at the readhead.
If the sense wires are open circuit then the voltage can be adjusted through the UCCsuite software. In both cases the scale supply voltage is nominally +5 V and can be adjusted to a maximum of +7 V. The sense and supply signals should be connected as close to the encoder as possible (see diagram below):
The scale inputs support a quadrature waveform with a minimum edge separation of 50 ns, which equates to 20 million counts per second with an ideal waveform.
| Encoder resolution | Maximum move speed |
|---|---|
| 1 µm | 20 m/s |
| 0.1 µm | 2 m/s |
| 50 nm | 1 m/s |
| 1 nm | 0.02 m/s |
UCC MMI-2 scale signal interface circuit
UCC MMI-2 scale error interface circuit
The UCC MMI-2 supports the error signal provided by Renishaw's digital incremental encoders. The UCC MMI-2 can also detect tri-state conditions on the A and B signals. If the error signal is not integrated into the connected encoder, then the user should connect pin 3 (Error - ) to pin 7 ( +V scale).
UCC MMI-2 scale limit switch interface circuit
If scale limit switch signals are integrated into the the encoder being used then the following diagram should be referenced to ensure compatibility with the UCC MMI-2.
