Siemens SIMATIC S7-200 System Manual page 108

S7-200 Programmable Controller System Manual
Example: Transmit and Receive Instructions, continued
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Network 1 //Receive complete interrupt routine:
//1. If receive status shows receive of
// end character, then attach a
// 10 ms timer to trigger a transmit and return.
//2. If the receive completed for any other reason,
// then start a new receive.
LDB= SMB86, 16#20
MOVB 10, SMB34
ATCH INT_1, 10
CRETI
NOT
RCV VB100, 0
Network 1 //10-ms Timer interrupt:
//1. Detach timer interrupt.
//2. Transmit message back to user on port.
LD SM0.0
DTCH 10
XMT VB100, 0
Network 1 //Transmit Complete interrupt:
//Enable another receive.
LD SM0.0
RCV VB100, 0