GE VersaMax PLC, User Manual

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11.19 SVCREQ 24: Reset Ethernet Daughter Board
Service request #24 is added for user to reset Ethernet daughterboard from ladder. The
FNC number “24” is the instruction number to reset Ethernet daughterboard on
IC200CPUE05. The first WORD in the parameter block for the SVC_REQ #24 should be
“0” to reset Ethernet daughterboard. Other values are ignored and SVC_REQ #24 won’t
take effect or pass power flow.
Note It is important to invoke SVC_REQ #24 for Ethernet daughterboard for only one
sweep at a time. Each time this function executes, the target daughterboard will be reset
regardless of whether it has finished starting up from a previous reset. If multiple reset
requests (for example, push button to reset Ethernet) occur simultaneously, Ethernet
daughterboard will be reset only once rather than multiple times.
SVC_REQ #24 is useful to recover Ethernet interface from failures caused by heavy
traffic or high bit-error-rate. PLC fault table and LAN status bits below can be used to
determine whether the Ethernet interface on IC200CPUE05 is healthy or faulted. The
meaning of each individual status bit can be found in chapter 13 of GFK-1503 VersaMax
PLC User Manual. Users are advised to use SVC_REQ #24 to reset Ethernet interface
when any of the following events occurs:
• In PLC fault table a “loss of Ethernet interface” fault is logged.
• In PLC fault table a “loss of Ethernet interface” fault is logged.
• When bit 15 (LAN Interface Lockup) is set, Ethernet has encountered a lockup
problem. A reset is needed.
Status Bits Brief Description
1–2 Reserved, always 0
3 Full-duplex
4-12 Reserved, always 0
13 LAN OK
14 Resource problem
15 LAN Interface lockup
16 LAN Interface OK
17-80 Reserved
The Service Request Function GFK-1503E User Manual 221
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