8
Functions
Section 1-2
1-2
Functions
1-2-1
I/O Unit Interface Specifications
Item
Specification
Communications method
Special protocol
Number of I/O Units
8 Units max.
Maximum number of points
Total inputs/outputs: 1,024 points (bits)
Communications dis-
tance
Total length
3 m max.
Between Units
1 m max. (Cable included with Unit is
40 mm.)
Communications power supply
Supplied from the Communications
Unit to the I/O Unit (0.4 A max.)
Relationship to DeviceNet
After the I/O Unit interface is estab-
lished, DeviceNet communications con-
tinue normally, even if an error occurs
on the I/O Unit interface.
Addresses
Automatically recognized when the
power to the Communications Unit is
turned ON.
I/O configuration
Automatically recognized when the
power to the Communications Unit is
turned ON. If the configuration is
changed while the power supply is ON,
a configuration error will occur.
Self-diagnostic func-
tions
Configuration errors
The I/O Unit configuration is constantly
checked while power is supplied. If a
mismatch occurs while the power is
turned ON, I/O refreshing for all I/O
Units is stopped.
Special I/O Unit
errors
Errors are detected in the Special I/O
Units (Analog Input Units, Analog Out-
put Units, Temperature Input Units, and
Counter Units) on the I/O Unit interface.
I/O Unit interface
errors
Communications stop when there is no
communications response from an I/O
Unit.
Communications stop when there is no
specific response from the last I/O Unit
(terminator).
Communications stop when nine or
more I/O Units are connected.
Power supply over-
load to I/O Units
The power supply to the I/O Units and I/
O refreshing for all I/O Units are
stopped when the power supply to the
I/O Units through the Communications
Unit exceeds 0.4 A.
Error detection
Frame error check; CRC-CCITT check
Содержание DRT1-COM
Страница 1: ...OPERATION MANUAL Cat No W348 E1 05 DRT1 COM GT1 Series DeviceNet MULTIPLE I O TERMINAL ...
Страница 2: ...DRT1 COM GT1 Series DeviceNet MULTIPLE I O TERMINAL Operation Manual Revised May 2003 ...
Страница 3: ...iv ...
Страница 5: ...vi ...
Страница 13: ...xvi EC Directives 6 3 Keep DeviceNet communications cables as short as possible and ground to 100 Ω min ...
Страница 232: ...Authorized Distributor Cat No W348 E1 05 Note Specifications subject to change without notice Printed in Japan ...
Страница 233: ...DRT1 COM GT1 Series DeviceNet MULTIPLE I O TERMINAL Cat No W348 E1 05 OPERATION MANUAL ...