Omron SYSMAC CS1W-RPT01 Operation Manual page 208

Section 6-1
Introduction
using the message service, it is advisable to prevent this situation from oc-
curring by performing resend processing at the node where instructions
are issued. With the SEND, RECV, and CMND instructions, resend pro-
cessing is performed automatically once the number of retries has been
set, so be sure to specify a number other than "0" for the number of retries.
2. If the total number of data link words is increased, the communications cy-
cle time will be increased. This may cause timeout errors to occur when
waiting for the response. In that case, lengthen the response monitor time
(control data word C+5).
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