CJ1G-H FBS USING RSTA COMMAND

[mr_shadow 0]

Hi everybody; I'm a new user of FB's in plc i defined a bool array x[number of elements=15] and i want to reset all of this array with only one command like "RSTA". How can i do this? i couldn't find the syntaxes i think. when i write "set x[0]" or x[1], e.t.c. it works, but when i want to make this with multiple set-reset commands i couldn't do it. can anybody help me?

[BobB 58]

How about MOV #0000 to the channel or the BSET command?

[Guest anonymous]

Hello Mr Shadow, The problem that you are having, is due to the fact that arrays of type BOOL cannot be used in place of words (INT, UINT etc) within the instruction set. To be able to do what you are asking (using the 'RSTA' instruction), you would need to define a second variable (type UINT) using the AT Address option, which would correspond to an AT Address you would need to define for your BOOL array. E.g. MyArrayX Type = BOOL Array Size = 16 AT Address = (e.g.) W100 This defines your array, Then - MyArrayWord Type = UINT Array Size = 0 AT Address = W100 This will then allow you to reference your array as a single word, which can then be used in the RSTA instruction (or indeed as BobB points out, MOV or BSET instructions). Hope this helps Regards anonymous

[mr_shadow 0]

i did it by thinking each bit of the array as a word array. the bit is always the first bit of the word array's element for example if you think x[number of elements=16] and you use the first bits of the array you must write "SETA X[0], &0, &1" then if you want to reset all first bits you write "RSTA X[0], &0, &256"(16X16). In this solution you waste bits and you waste program memory for single set operation because you write SETA (NOT SET). Also For LD command you have to use BTEST command because your bits are the first elemnts of the word array. As your approach to the problem it is not useful because if you make the variable as "AT" AND you assigned w400 for example and you use two or three times these function block in different places in the program then the function block doesn't work as a function f(x) it works like a subroutine i think