CTH200 Series PLC User Manual
MSB LSB
00—Non-intelligent
I/O module
01—Intelligent
module
10—Reserved
11-- Reserved
00—No input
01--2 AI or 8 DI
10--4 AI or 16 DI
11--8 AI or 32 DI
00—No output
01--2 AQ or 8 DQ
10--4 AQ or 16 DQ
11--8 AQ or 32 DQ
Odd byte (module error register) format:
MSB LSB
t: Terminal
block loose
error
SMW22 to SMW26: Scanning time
SMW22, SMW24 and SMW26 offer information of scanning time: minimum scanning time,
maximum scanning time and last scanning time calculate by ms
Function description(read only)
Recorded minimum scanning time after entering RUN mode
Recorded maximum scanning time after entering RUN mode
SMB28 to SMB29: Analog potentiometer
Special memory bytes 28 and 29 contain values corresponding to analog potentiometer 0 and 1
axes position. The analog potentiometer is located in front of the CPU behind the access gate.
Use a screwdriver to adjust the potentiometer (increasing clockwise or decreasing
counterclockwise). This type of read-only value can be used by a program to perform various
functions, such as updating the current value for a timer or counter, inputting or changing a
preset value, or setting limits. It also has a rated range of 0 to 255, and reliable repeats of ±2
counts. Detailed description is shown in the following table:
Function description(read only)
Input of memory analog regulator 0. Updating it for every scan in
STOP/RUN mode
Input of memory analog regulator 1. Updating it for every scan in
STOP/RUN mode