| 摘要 |
PURPOSE:To recognize easily whether a relay takes both states of energizing and de-energizing or not by corresponding a state change storage flag of 1-bit to each of the relays in a controller. CONSTITUTION:The state change storage flag, which corresponds one bit to each of the relays in the programmable controller and in which whether the state of the relay is changed or not is stored, is provided in a state change storage section 507. As debugging of a program proceeds, the state of some relays is changed and that of the remaining relays is unchanged. When the state is changed, the state change storage flag of the relay is rewritten into ''1''. The content of the state change storage section is displayed on a CRT provided on a programming panel 6 depending thereupon, allowing to inform which relays are not tested yet. |
