YOKOGAWA F3LP32-0N, User Manual

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4-6
IM 34M06H43-02E 2nd Edition : Sep.30, 2019-00
4.2 Response Time of a Single Layer System
Use the equations below to obtain the following components of the response
time:
- Scan time of the sequence program in the transmitting and receiving
stations
- Link refresh processing time in the transmitting and receiving stations
- Cyclic transmission processing time
■
For Normal Mode
(1) Maximum response time of a single layer system (T
LD
)
T
LD
= ST
S
+ LR
S

2 + CT

3 + (ST
R

2) + (LR
R

2) + IM (unit: ms)
where, ST
S
= Sequence program scan time of transmitting station
LR
S
= Link refresh time of transmitting station
CT = Cyclic transmission time
ST
R
= Sequence program scan time of transmitting station
LR
R
= Link refresh time of receiving station
IM = Internal processing time (constant: 50 ms)
Note: The internal processing time of high-speed mode is 30 ms.
(2) Link Refresh Time (LR)
LR = (RL
L
/16+RG
L
)

0.012

1.2 (unit: ms)
where, RL
L
= Number of link relays used in the station
RG
L
= Number of link registers used in the station
(3) Cyclic Transmission Time (CT)
CT = (RL
A
+ RG
A

16 + 200

S)

BT + 1.3

S + 8 (unit: ms)
where
RL
A
= Total number of link relays used in all stations
RG
A
= Total number of link registers used in all stations
BT = Transmission time per bit
BT = 0.0008 (1.25Mbps)
BT = 0.0016 (625kbps)
BT = 0.004 (250kbps)
BT = 0.008 (125kbps)
S = Total number of connected stations