Allen-Bradley 1747-OC Series, User Manual

Page: 105 / 126

1747-UM001A-US-P - March 2000
Specifications A-7
Estimate minimum output scan time
Estimate maximum output scan time
Estimate output scan time plus processor overhead
Discrete I/O Modules:
number of class 0 input words: x 46 =
Specialty I/O Modules (Class 1)
number of 1746-BAS modules (class 1):
number of 1746-NIO4V modules:
number of 1746-FIO4V modules:
number of 1746-NO4V modules: x 500 =
x 277 =
x 277 =
x 330 =
Specialty I/O (Class 3 and 4)
number of 1746-HSCE modules:
number of 1747-SN modules:
number of 1746-BAS modules (class 4): x 608 =
x 1208 =
x 655 =
Forced Output Overhead
number of class 0 output words:
number of specialty output words:
number of specialty I/O modules: x 6 =
x 9 =
x 30 =
Output Scan Overhead 33
Minimum Output Scan Time (total)
Minimum Output Scan Time
(from above table)
Maximum Specialty I/O Output Scan Time
number of class 1 specialty I/O modules:
number of class 3 and 4 specialty I/O modules: x 50 =
x 200 =
Maximum Output Scan Time (total)
Minimum or Maximum Output Scan Time
(from above tables)
Overhead if DII Enabled 60
Processor Overhead minimum = 140
maximum = 200
Output Scan Time Plus Processor Overhead (total)
Allen-Bradley HMIs