Allen-Bradley 1394 SERCOS, User Manual

Page: 210 / 301

Publication 1394-5.0 — May 2000
A-12 Specifications
Dedicated Discrete I/O Specifications
The table below lists the dedicated discrete I/O specifications for the
system module (1394
x -SJT xx -C- xx , -L- xx , and -T- xx systems) .
Serial I/O Specifications
The table below lists the dedicated serial I/O specifications for the
system module (1394
x -SJT xx -C- xx , -L- xx , and -T- xx systems).
The: Is:
Number of dedicated discrete
inputs 16 (4 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, 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 24
V position registration inputs.
Input response time 5 ms maximum; 1
µ
s maximum for position registration
inputs
The: Is:
Number of serial channels 2 (serial port A and serial port B)
Channel type Optically isolated RS-232 or RS-422; each channel
individually configured via internal switch
Information code ASCII
Baud rate User-selectable up to 128 kbaud (rs-422); 115.2 kbaud
(RS-232)
Number of start bits One
Number of stop bits One
Word length 8 bits (7 data bits plus 1 parity bit)
Parity Space parity transmitted; receive parity ignored (may be
mark, space, even, or odd)
Duplex Full or half (user-selectable)
Data synchronization XON (control-q)/XOFF (control-s)
Front panel connectors IBM-PC/AT compatible 9-pin D-type female
RS-422 termination User-selectable 220 ohm resistor via internal switch