If you only want the toggle bit, I can do it in 7 steps. 1) IN M01 2) IN RI01 3) OUT M01 4) SUB 5) BIP 8 6) IN ~BO01 7) OUT BO01 Mark Blunier > What I want to do is use a calc block to set a bit (BO01) to 1 for one > minute at midnight on the first day of every month. I've set RI01 = =3D3D > Station.day, RI02 to Station.hour and RI03 to Station.Minute. Then I > want to use this bit to toggle a SWCH block and hold it toggle for 1 > month until the next 1st day at midnight comes and toggle the=20 > other way. > Here is what I have so far but I cannot get it to remember the toggle > bit so as to keep the SWCH Block Toggled >=20 > (1)In RI01 > (2)SUB M01 (which is 1.0) > (3)MIN=3D20 > (4)In RI02 > (5)In RI03 > (6)Add 3 > (7)BIZ 9 (Set the Bit) > (8)GTO 11 (Clr the Bit) > (9)SET BO01 > (10)EXIT > (11)CLR BO01 >=20 > Then I was using a Flip Flop to remember this BO01 but I=20 > don't know how > to reset it when the next month comes around so that it will=20 > change the > toggle on the SWCH Block. Any help would be much appreciated! >=20 >=20 > Dale Gillis >=20 > =3D20 > =20 > =20 > ______________________________________________________________ > _________ > This mailing list is neither sponsored nor endorsed by=20 > Invensys Process > Systems (formerly The Foxboro Company). Use the info you=20 > obtain here at > your own risks. Read=20 http://www.thecassandraproject.org/disclaimer.html =20 foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave