SSI Input/Output (SO) Module (RMC150)

Note:
Delta does not recommending using the SO module. Consider using the Universal I/O Module instead, as it supports the same SSI output retransmission functionality as the SO module.

The SSI Input/Output (SO) module allows for synchronizing multiple RMCs to a single SSI position transducer, such as gearing multiple axes to a feed chain.

The SO module’s two ±10V drive outputs and SSI input can be used for machine control. The SSI output retransmits the position data received from the SSI input as though it were itself an SSI transducer.

This allows the SSI output on one SO module to be fed into an SSI input on another RMC’s SSI or SO module. Both RMCs will see the same SSI position data, although the retransmission incurs one loop time of delay in the position data on the second RMC. Many RMCs can be chained together in this way, with an additional delay introduced for each retransmission.

The SO module is a modified SSI module, and acts like a standard two-axis SSI module (-S), except that the second axis has an SSI output instead of an SSI input. RMCWin and RMCTools will recognize the SO module as an SSI module, but it will function as an SO module.

Features

One SSI input per module
One SSI output which retransmits the SSI input data.
Supports SSI devices with Binary or Gray Code data from 8 to 31 bits in length
Differential RS-422 SSI interface
Two isolated, ±10 V, 12-bit control outputs per module
Current output up to ±200 mA with VC2124 converter option

Part Number

The part number of the SO module is SOn, where n is the number of SO modules.

For example, RMC150E-S1-SO is an RMC150E with one SSI module and one SO module.

Setting Up the SO Module

For setting up axes associated with the SO module, see the SSI (S) Module topic.

Specifications

For general specifications on the RMC150, see the RMC150 Overview topic.

SSI Input
Input	RS422 differential (does not support single-ended)
Clock Output	RS422 differential (does not support single-ended)
Clock Frequency	user-selectable 230kHz, 921kHz
Required Cable Type	Twisted pair, shielded
Maximum Cable Length	Transducer Dependent, approx. 300-600ft. See the SSI Clock Rate topic for details.
ESD Protection	15kV
Resolution	Transducer dependent
Count Encoding	Binary or Gray Code
Count Data Length	8 to 31 bits
SSI Output
Data Output	RS422 differential (does not support single-ended)
Clock Input	RS422 differential (does not support single-ended)
Control Outputs
Range	±10 V @ 5 mA (2 kΩ or greater load) (For current output, use the VC2124 accessory:±10 mA to ±200 mA in 10 mA steps)
Tolerance	At 10 V: +200 mV, -100 mV At 0 V: ±50 mV At -10 V: +100 mV, -200 mV
Resolution	12 bits
Output Isolation	750VDC, optically isolated
Overload Protection	One-second short-circuit duration
Overvoltage Protection	Outputs are protected by clamp diodes

LEDS

Axis 0 LED

Axis LED applies to the Drive 0 output or feedback input 0 as described below:

If Drive 0 is assigned to an axis that has an input (i.e. isn't output-only), then that axis will own the Axis 0 LED.
Otherwise, if a reference input axis (no output) uses input 0, then that axis will own the Axis 0 LED.
Otherwise, if Drive 0 is assigned to an output-only axis, then that axis will own Axis 0 LED.

Axis 1 LED

Axis 1 LED applies to the Drive 1 output or feedback input 1 as described below:

If Drive 1 is assigned to an axis that has an input (i.e. isn't output-only), then that axis will own the Axis 1 LED.
Otherwise, if a reference input axis (no output) uses input 1, then that axis will own the Axis 1 LED.
Otherwise, if Drive 1 is assigned to an output-only axis, then that axis will own the Axis 1 LED.

LED Colors

State	Description
Steady Off	No power or the output/input is not assigned to an axis.
Steady Green	The axis is either in closed loop control or is a reference axis. The axis is not halted.
Flashing Green	The output is in open loop and the axis is not halted (not possible for reference axes).
Flashing Red	A Closed Loop Halt or External Halt has occurred because an error bit is set (not possible for reference axes). The LED will not turn red due to a halt caused by a halt command.
Steady Red	An Open Loop Halt or Direct Output Halt has occurred because an error bit is set (for reference axes, any halt has occurred). The LED will not turn red due to a halt caused by a halt command.