Table of Contents
Advertisement
Chapter 5 Descriptions of Function Instructions
5.1 The Format of Function Instructions
In this chapter we will introduce the function instructions of FBs-PLC in details. All the explanations for each function will
be divided into four parts including input control, instruction number/name, operand and function output. If use the FP-07
to input the mnemonic instruction, except for the T, C, SET, RST and SFC instructions that can be entered directly by
pressing a single key stroke on FP-07, other function instructions must be entered by key in the instruction number rather
than the instruction name. An example is shown in below.
Example 1: Single input instruction
Operation control
Example 2: Multiple input instruction
Clock
Up/Down count
Clear control
Remark：The words inside the hollow box in mnemonic code field are the prompting message from FP-07 such as D:,
CV:, and Pr: and are not entered by the user.
5.1.1 Input Control
Except for the seven function instructions that do not have input control, the number of the input control of other FBs-PLC
function instructions can be ranged from one to four. Execution of the instructions and operations is dependent on the
input control signal or the combinations of the several input control signals. The ladder programming software for FACON
PLC - Winprollader can help user to complete the complex design and document works. In the ladder program window we
can see all the function instructions were displayed by blocks surrounded with abbreviated words for ease of
comprehension, include inputs, outs, function name, and parameter names. As shown in example 2 above, the first input
mark "CK↑" indicates when the "CK↑" input changes from 0 to 1 (rising edge) the counter will be increased or
decreased by 1 (depending on the "U/D" status). The second input mark "U/D" with a status of 1 represents the word
above slash ("U") and the status 0 represents the word under slash ("D"), that is second input "U/D" states =1, the counter
will be increased by 1 when "CK↑" input from 0 to 1, and when "U/D"=0, the counter will be decreased by 1. The third
input mark "CLR" indicates when this input is 1, the counter will be cleared to 0. Chapter 8~9 give the descriptions of input
control of each function instruction.
Remark: There are total of seven instructions whose input control should be directly connected to the origin-line
those are MCE, SKPE, LBL, RTS, RTI, FOR, and NEXT. Please refer to chapter 6 and 7 for more
detailed explanations.
Ladder Diagram
15
EN
R
(+1)
7.UDCTR
CV :
0
CUP
CK
R
PV :
10
U/D
CLR
Carry(FO0)
0
CY
Count-Up(FO0)
5 - 1
FP-07 Mnemonic code
FUN
15
D :
R 0
FUN
7
CV: R 0
PV:
10
Hide quick links:
Advertisement
Table of Contents
