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GEM for SIPLACE V7.01 Page 22 of 251 ©Siem ens AG, all rights reserved  5HODWHG9DULDEOHV The f ollowing table lists the variables ( SV's, EC's, or DVVALS) which are relevant to establishing com m unicati…

GEM for SIPLACE V7.01

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The current Communication State will be one of the following values. There is no Variable

indicating the Communication State. The communication State is presented to the

Operator on the main Operator Interface screen.

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The SECS link to the Host is disabled at the SIPLACE. The Equipment will send no

messages to the Host. The Equipment will not respond to a Host-initiated ENQ.

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When communications are Enabled, the Equipment's intention is to be in communication

with the Host. Whether or no the SIPLACE is currently communicating with the Host

determines which sub-state of the Enabled super-state the SIPLACE is in.

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The SECS link between the SIPLACE and the Host is operating normally.

Periodically, the Equipment will send a "Heartbeat" message S1F1 to ensure that the link

is still operating. The heartbeat frequency is controlled by Equipment Constant

HEARTBEAT. HEARTBEAT (VID 1002055) can range from 0 to 32000, with default

value 30.

If the Equipment encounters a SECS-I Retry Limit (RTY) error when attempting to send a

block to the Host, it discards any messages queued for send and the communication state

transits to ENABLED.

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The SECS link to the Host is enabled at the SIPLACE, and the Equipment is attempting to

determine if the link is active. The Equipment periodically sends S1F13 (Establish

Communications Request).

If the connect is not successful for any reason, the Equipment will try again periodically

forever. The time between attempts is controlled by the Equipment Constant

ESTABLISHCOMMUNICATIONSTIMER. This variable (VID 1002003) can range from 0

to 32000 seconds, with default of 60 seconds.

Once the Host has responded with S1F14 (Establish Communications Acknowledge), the

Communication State will change to COMMUNICATING.

The Host can also attempt to establish communications by sending S1F13. The

Equipment will accept the message and respond with S1F14 and the Communication

State will change to COMMUNICATING.

In ENABLED state, the SIPLACE will accept messages from the Host, but will ignore any

messages except S1F13 and S1F14. The SIPLACE will respond to the S1F13 while the

Communication State is ENABLED or COMMUNICATING, but it will not send S1F13 once

communications have been established.

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At Power Up (or System Start), the Equipment Constant INITCOMMSTATE (vid

1002002) controls whether state is initialized to DISABLED or ENABLED. The factory

setting is DISABLED.

GEM for SIPLACE V7.01

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The following table lists the variables (SV's, EC's, or DVVALS) which are relevant to

establishing communications . For a more complete description of these variables, see

"Appendix A -- Variables".

Variable Name VID

CONFIGCONNECT 1002004

INITCOMMSTATE 1002002

ESTABLISHCOMMUNICATIONSTIMER 1002003

HEARTBEAT 1002055

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The SIPLACE supports the following Establish Communications message formats for

older Host implementations. If the Host intends to use the Control State Off-Line feature,

CONFIGCONNECT should always be set to S1F13/14.

S1F1/S1F2

S1F65/S1F66

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This section describes the Control characteristics of the Equipment. The Equipment may

be in one of the following control states. This value is reflected in status variable

CONTROLSTATE (VID 1002006).

Value State

1 Off-Line/Equipment Off-Line

2 Off-Line/Attempt On-Line

3 Off-Line/Host Off-Line

4 On-Line/Local

5 On-Line/Remote

GEM for SIPLACE V7.01

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The Control State of the Equipment is illustrated in the Control Finite State Diagram. The

SIPLACE behaves differently and will accept different messages depending on its current

control state. The purpose of this diagram is to make clear to the Host exactly what is

happening at the Equipment. The logic for these states and transitions is the logic

specified in the GEM standard.

Equipment C

Off-Line

Host

Off-Line

Attempt

On-Line

Local Remote

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