Estimate Minimum Output Scan Time; Estimate Maximum Output Scan Time; Estimate Output Scan Time Plus Processor Overhead - Allen-Bradley 1747-OC Series User Manual

Allen-Bradley HMIs

Estimate minimum output scan time

Discrete I/O Modules:
number of class 0 input words:
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:
Specialty I/O (Class 3 and 4)
number of 1746-HSCE modules:
number of 1747-SN modules:
number of 1746-BAS modules (class 4):
Forced Output Overhead
number of class 0 output words:
number of specialty output words:
number of specialty I/O modules:
Output Scan Overhead
Minimum Output Scan Time (total)

Estimate maximum output scan time

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:
Maximum Output Scan Time (total)

Estimate output scan time plus processor overhead

Minimum or Maximum Output Scan Time
(from above tables)
Overhead if DII Enabled
Processor Overhead
Output Scan Time Plus Processor Overhead (total)
Specifications
x 46 =
x 500 =
x 277 =
x 277 =
x 330 =
x 608 =
x 1208 =
x 655 =
x 6 =
x 9 =
x 30 =
33
x 50 =
x 200 =
60
minimum = 140
maximum = 200
1747-UM001A-US-P - March 2000
A-7