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SIPLACE GEM for S25HM, S27HM, HS50 , HS60 SW Version GEM 503.02 HOST Inter fac e Manual Page 132 of 243 ©Siemens AG, all rights reser ved 5 SECS Scenarios Unless otherwise noted in this section, the Com m unications Stat…

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SIPLACE GEM for S25HM, S27HM, HS50, HS60 SW Version GEM 503.02
HOST Interface Manual
©Siemens AG, all rights reserved page 131 of 243
4.16 Stream 14
not used
SIPLACE GEM for S25HM, S27HM, HS50 , HS60 SW Version GEM 503.02
HOST Interface Manual
Page 132 of 243 ©Siemens AG, all rights reserved
5 SECS Scenarios
Unless otherwise noted in this section, the Communications State is "Communicating"
and the Control state is either "On-Line/Local" or "On-Line/Remote".
5.1 Equipment Communications
5.1.1 Equipment Establishes Communications
Assumption: Equipment's Communication state is "Enabled/Not Communicating".
Step SECS Message Description
1. H <- E S1F13 W Equipment attempts to send Establish
Communications Request.
2. If the send is not successful, or if no reply is
received from the Host, wait
„ESTABLISHCOMMUNICATIONSTIMER“
seconds, then go to step 1.
3. H -> E S1F14 The Host responds with Establish
Communications Acknowledge. If COMMACK
in this message is non-zero, wait
„ESTABLISHCOMMUNICATIONSTIMER“
seconds, then go to step 1. If COMMACK is
zero, proceed to the next step.
4. Communications is successfully established.
The Equipment changes its communication
state to Communicating. Normal SECS
message processing begins.
SIPLACE GEM for S25HM, S27HM, HS50, HS60 SW Version GEM 503.02
HOST Interface Manual
©Siemens AG, all rights reserved page 133 of 243
5.1.2 Host Establishes Communications
Assumption: Equipment's Communication state is either "Enabled/Not Communicating"
or "Enabled/Communicating".
Step SECS Message Description
1. H -> E S1F13 W Host sends Establish Communications
Request.
2. H <- E S1F14 The Equipment responds with Establish
Communications Acknowledge, with
COMMACK set to zero. After this message is
successfully sent, communications is
established. If the current communication state
is „Not Communicating“, the Equipment
changes its communication state to
„Communicating“. If the state is
„Communicating“, no change in communication
state occurs. In either case, subsequently
received messages are processed normally.
5.1.3 Simultaneous Establish
Assumption: Equipment's Communication state is "Enabled/Not Communicating".
Step SECS Message Description
1. H <- E S1F13 W Equipment sends Establish Communications
Request.
2. H -> E S1F13 W Host sends Establish Communications
Request.
3. H <- E S1F14 The Equipment responds with Establish
Communications Acknowledge, with
COMMACK set to zero. After this message is
successfully sent, communications is
established. The Equipment changes its
communication state to Communicating.
4. H -> E S1F14 The Host responds with Establish
Communications Acknowledge, with
COMMACK set to zero. This step could occur
before step 3, in which case communications
would be established at this step.