Specifications
Publication GMC-SG001E-EN-P — June 2001
1394 Drive System Family 4-27
Miscellaneous Specifications
The following section contains the dedicated discrete I/O specifications for the 1394 SERCOS interface
system, as well as the encoder input, dedicated discrete I/O, serial I/O, DH-485, Flex I/O, GMC System,
remote I/O adapter, and AxisLink specifications for the 1394 systems modules (1394x-SJTxx-C, -L, -T, -A).
SERCOS Interface System Dedicated Discrete I/O Specifications
Dedicated Discrete I/O Specifications (1394x-SJTxx-C-xx, -L-xx, and -T-xx)
Dedicated Discrete I/O Specifications (1394x-SJTxx-A-xx)
Specification Description
Number of dedicated discrete inputs 24 (6 each for axis 0, 1, 2, and 3)
Dedicated discrete input functions
Home limit switch, positive overtravel limit switch, negative overtravel limit
switch, position registration_1 and position registration_2, Enable.
Input type Optically isolated
Operating voltage
• 24V DC (nominal)
• ON state: 17.5-38V DC, 5-15 mA
• OFF state: <6.9V DC, <1.5 mA leakage
Input impedance 3.5 kohms (resistive) per input
Input response time 20 ms maximum; 1 µs maximum for position registration inputs
Specification Description
Number of dedicated discrete inputs 24 (6 each for axis 0, 1, 2, and 3)
Dedicated discrete input functions
Home limit switch, positive overtravel limit switch, negative overtravel limit switch,
2 position registrations (5V or 24V), and thermal fault.
Input type Optically isolated
Operating voltage 24V DC, 28V DC maximum or 5V DC nominal; 10V DC maximum for position registration inputs
Input On current 12 mA per input (nominal); 2.5 mA for position registration inputs
Input impedance 2 kohms (resistive) per input; 8.8 kohms (resistive) for 24V position registration inputs.
Input response time 5 ms maximum; 1 µs maximum for position registration inputs
Specification Description
Number of dedicated discrete inputs 5
Dedicated discrete input functions 1 Enable, 4 fault resets.
Input type Optically isolated
Operating voltage 24V DC, 28V DC maximum or 5V DC nominal; 10V DC maximum for position registration inputs
Input On current 12 mA per input (nominal); 2.5 mA for position registration inputs
Input impedance 2 kohms (resistive) per input; 8.8 kohms (resistive) for 24V position registration inputs
Input response time 5 ms maximum