Chapter 2 Devices 2_ 2.2.16 Additional Remarks on Special Auxiliary Relays and Special Data Registers 1. Scan timeout timer SM8/SR8 When a scan timeout occurs during the execution of the program, the error LED on the PLC changes to continuous ON, and SM8 changes to ON. SR8 contains the step address at which the watchdog timer changed to ON. 2-79 Special data Time to refresh register SR652–SR655 Register is refreshed by the system. SR658–SR726 Register is refreshed by the system. SR731–SR738 Register is refreshed by the system. SR741–SR748 Register is refreshed by the system. SR751-SR768 Register is refreshed by you. SR771–SR778 Register is refreshed by the system.
SR781–SR788 Register is refreshed by the system. SR791–SR806 Register is refreshed by the system. SR811–SR818 Register is refreshed by you. SR820 Refresh the register according to the settings in CANopen Builder. SR821 Refresh the register when the firmware is updated. SR822 Refresh the register according to the settings in HWCONFIG. SR823–SR893 Register is refreshed by the system. SR900–SR901 Register is refreshed by the system. SR902 Register is refreshed by you. SR1000–SR1006 1. Register is refreshed by you. 2. Register is refreshed after power-on or after HWCONFIG is downloaded. SR1007 Register is refreshed by the system. SR1009 Register is refreshed by the system.
SR1010 Register is refreshed by you. SR1011–SR1014 Register is refreshed by the system. SR1015 Register is refreshed by you. SR1020–SR1107 1. Refresh the register when a connection is established. 2. Refresh the register every scan cycle. SR1116–SR1117 Refresh the register when the program is downloaded to the PLC. SR1120–SR1183 Refresh the register when the communication is complete. SR1312-SR1315 Refresh the register during communication Refresh the register when the parameter is downloaded to the PLC, or when the PLC is supplied with power. SR1318–SR1320 SR1335–SR1336 Refresh the register every scan cycle after the function of data exchange is enabled.
SR1340–SR1371 Refresh the register when there is an error. SR1375–SR1376 Refresh the register every scan cycle after the function of data exchange is enabled. SR1380–SR1411 Refresh the register when there is an error. SR1553~SR1555 Register is refreshed by you. SR1556~SR1568 Register is refreshed by the system.